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Cisco APIC Basic Configuration Guide, Release (x)

This chapter contains the following sections:

Access Rights Workflow Dependencies

The Cisco Application Centric Infrastructure (ACI) RBAC rules enable or restrict access to some or all of the fabric. For example, in order to configure a leaf switch for bare metal server access, the logged in administrator must have rights to the domain. By default, a tenant administrator does not have rights to the domain. In this case, a tenant administrator who plans to use a bare metal server connected to a leaf switch could not complete all the necessary steps to do so. The tenant administrator would have to coordinate with a fabric administrator who has rights to the domain. The fabric administrator would set up the switch configuration policies that the tenant administrator would use to deploy an application policy that uses the bare metal server attached to an ACI leaf switch.

User Access, Authorization, and Accounting

Application Policy Infrastructure Controller (APIC) policies manage the authentication, authorization, and accounting (AAA) functions of the Cisco Application Centric Infrastructure (ACI) fabric. The combination of user privileges, roles, and domains with access rights inheritance enables administrators to configure AAA functions at the managed object level in a granular fashion. These configurations can be implemented using the REST API, the CLI, or the GUI.


Note

There is a known limitation where you cannot have more than 32 characters for the login domain name. In addition, the combined number of characters for the login domain name and the user name cannot exceed 64 characters.


Multiple Tenant Support

A core Application Policy Infrastructure Controller (APIC) internal data access control system provides multitenant isolation and prevents information privacy from being compromised across tenants. Read/write restrictions prevent any tenant from seeing any other tenant's configuration, statistics, faults, or event data. Unless the administrator assigns permissions to do so, tenants are restricted from reading fabric configuration, policies, statistics, faults, or events.

User Access: Roles, Privileges, and Security Domains

The APIC provides access according to a user’s role through role-based access control (RBAC). An Cisco Application Centric Infrastructure (ACI) fabric user is associated with the following:

  • A set of roles

  • For each role, a privilege type: no access, read-only, or read-write

  • One or more security domain tags that identify the portions of the management information tree (MIT) that a user can access

The ACI fabric manages access privileges at the managed object (MO) level. A privilege is an MO that enables or restricts access to a particular function within the system. For example, fabric-equipment is a privilege bit. This bit is set by the Application Policy Infrastructure Controller (APIC) on all objects that correspond to equipment in the physical fabric.

A role is a collection of privilege bits. For example, because an “admin” role is configured with privilege bits for “fabric-equipment” and “tenant-security,” the “admin” role has access to all objects that correspond to equipment of the fabric and tenant security.

A security domain is a tag associated with a certain subtree in the ACI MIT object hierarchy. For example, the default tenant “common” has a domain tag . Similarly, the special domain tag includes the entire MIT object tree. An administrator can assign custom domain tags to the MIT object hierarchy. For example, an administrator could assign the “solar” domain tag to the tenant named solar. Within the MIT, only certain objects can be tagged as security domains. For example, a tenant can be tagged as a security domain but objects within a tenant cannot.


Note

Security Domain password strength parameters can be configured by creating Custom Conditions or by selecting Any Three Conditions that are provided.


Creating a user and assigning a role to that user does not enable access rights. It is necessary to also assign the user to one or more security domains. By default, the ACI fabric includes two special pre-created domains:

  • —allows access to the entire MIT

  • — allows access to fabric infrastructure objects/subtrees, such as fabric access policies


Note

For read operations to the managed objects that a user's credentials do not allow, a "DN/Class Not Found" error is returned, not "DN/Class Unauthorized to read." For write operations to a managed object that a user's credentials do not allow, an HTTP Unauthorized error is returned. In the GUI, actions that a user's credentials do not allow, either they are not presented, or they are grayed out.


A set of predefined managed object classes can be associated with domains. These classes should not have overlapping containment. Examples of classes that support domain association are as follows:

  • Layer 2 and Layer 3 network managed objects

  • Network profiles (such as physical, Layer 2, Layer 3, management)

  • QoS policies

When an object that can be associated with a domain is created, the user must assign domain(s) to the object within the limits of the user's access rights. Domain assignment can be modified at any time.

If a virtual machine management (VMM) domain is tagged as a security domain, the users contained in the security domain can access the correspondingly tagged VMM domain. For example, if a tenant named solar is tagged with the security domain called sun and a VMM domain is also tagged with the security domain called sun, then users in the solar tenant can access the VMM domain according to their access rights.

Configuring a Local User

In the initial configuration script, the admin account is configured and the admin is the only user when the system starts. The APIC supports a granular, role-based access control system where user accounts can be created with various roles including non-admin users with fewer privileges.

Configuring a Local User Using the GUI

Before you begin

  • The ACI fabric is installed, APIC controllers are online, and the APIC cluster is formed and healthy.

  • As appropriate, the security domain(s) that the user will access are defined. For example, if the new use account will be restricted to accessing a tenant, the tenant domain is tagged accordingly.

  • An APIC user account is available that will enable the following:

    • Creating the TACACS+ provider.

    • Creating the local user account in the target security domain(s). If the target domain is , the login account used to create the new local user must be a fabric-wide administrator that has access to . If the target domain is a tenant, the login account used to create the new local user must be a tenant administrator that has full read write access rights to the target tenant domain.

Procedure


Step 1

On the menu bar, choose .

Step 2

In the Navigation pane, click Users and Local Users in the Work pane.

Step 3

In the Work pane, verify that you are in the Local Users tab.

The admin user is present by default

Step 4

In the Work pane, click on task icon drop-down list and select Create Local User.

Step 5

In the User Identity dialog box, perform the following actions:

  1. In the Login ID field, add an ID.

  2. In the Password field, enter the password.

    At the time a user sets their password, the APIC validates it against the following criteria:

  3. In the Confirm Password field, confirm the password.

  4. (Optional) For Certificate based authentication, in the User Certificate Attribute field, enter the user identity from the authentication certificate.

  5. Click Finish.

Step 6

In the Security dialog box, choose the desired security domain for the user, and click Next.

Step 7

In the Roles dialog box, click the radio buttons to choose the roles for your user, and click Next.

You can provide read-only or read/write privileges.

Step 8

In the Navigation pane, click the name of the user that you created. In the Work pane, expand the + sign next to your user in the Security Domains area.

The access privileges for your user are displayed.

Configuring SSH Public Key Authentication Using the GUI

Before you begin

  • Create a local user account in the target security domain(s). If the target domain is , the login account used to create the new local user must be a fabric-wide administrator that has access to . If the target domain is a tenant, the login account used to create the new local user must be a tenant administrator that has full read write access rights to the target tenant domain.

  • Generate a public key using the Unix command ssh-keygen.

    The default login domain must be set to local

Procedure


Step 1

On the menu bar, choose and confirm you are in the Local Users tab.

Step 2

In the Navigation pane, click the name of the user that you previously created.

Step 3

In the Work pane, expand the SSH Keys table, and insert the following information:

  1. In the Name field, enter a name for the key.

  2. In the Key field, insert the public key previously created. Click Update.

    Note 

    To create the SSH Private Key File for downloading to a remote location then in the menu bar, expand .


Configuring a Remote User

Instead of configuring local users, you can point the APIC at the centralized enterprise credential datacenter. The APIC supports Lightweight Directory Access Protocol (LDAP), active directory, RADIUS, and TACACS+.


Note

When an APIC is in minority (disconnected from the cluster), remote logins can fail because the ACI is a distributed system and the user information is distributed across APICS. Local logins, however, continue to work because they are local to the APIC.


Starting with the (1) release, Server Monitoring can be configured through RADIUS, TACACS+, LDAP, and RSA to determine whether the respective AAA servers are alive or not. Server monitoring feature uses the respective protocol login to check for server aliveness. For example, a LDAP server will use ldap login and a Radius server will use radius login with server monitoring to determine server aliveness.

To configure a remote user authenticated through an external authentication provider, you must meet the following prerequisites:

  • The DNS configuration should have already been resolved with the hostname of the RADIUS server.

  • You must configure the management subnet.

AV Pair on the External Authentication Server

The Cisco APIC requires that an administrator configure a Cisco AV Pair on an external authentication server. The Cisco AV pair specifies the APIC required RBAC roles and privileges for the user. The Cisco AV Pair format is the same for RADIUS, LDAP, or TACACS+.

To configure a Cisco AV Pair on an external authentication server, an administrator adds a Cisco AV pair to the existing user record. The Cisco AV pair format is as follows:

Starting with Cisco APIC release , if no UNIX ID is provided in AV Pair, the APIC allocates the unique UNIX user ID internally.


Note

The APIC Cisco AV-pair format is compatible and can co-exist with other Cisco AV-pair formats. APIC will pick up the first matching AV-pair from all the AV-pairs.


Starting with release (x), the AV Pair shell:domains=all//admin allows you to assign Read-only privileges to users and provide them access to the switches and run commands.

The APIC supports the following regexes:

Examples:

  • Example 1: A Cisco AV Pair that contains a single Security domain with only writeRoles:
  • Example 2: A Cisco AV Pair that contains a single Security domain with only readRoles:

Note

The "/" character is a separator between writeRoles and readRoles per Security domain and is required even if only one type of role is to be used.

The Cisco AVpair string is case sensitive. Although a fault may not be seen, using mismatching cases for the domain name or roles could lead to unexpected privileges being given.


An example configuration for an open RADIUS server (/etc/raddb/users) is as follows:

Best Practice for Assigning AV Pairs

As best practice,

Cisco recommends that you assign unique UNIX user ids in the range of to for the AV Pairs that are assigned to users when in bash shell (using SSH, Telnet or Serial/KVM consoles). If a situation arises when the Cisco AV Pair does not provide a UNIX user id, the user is assigned a user id of or similar number from the range that also enables the user's home directories, files, and processes accessible to remote users with a UNIX ID of

To ensure that your remote authentication server does NOT explicitly assign a UNIX ID in its cisco-av-pair response, open an SSH session to the APIC and login as an administrator (using a remote user account). Once logged in, run the following commands (replace “userid” with the username you logged in with):

The Cisco AVpair string is case sensitive. Although a fault may not be seen, using mismatching cases for the domain name or roles could lead to unexpected privileges being given.

Configuring an AV Pair on the External Authentication Server

The numerical value within the parentheses in the attribute/value (AV) pair string is used as the UNIX user ID of the user who is logged in using Secure Shell (SSH) or Telnet.

SUMMARY STEPS

  1. Configure an AV pair on the external authentication server.

DETAILED STEPS


Configure an AV pair on the external authentication server.

The Cisco AV pair definition is as follows (Cisco supports AV pairs with and without UNIX user IDs specified):
Example:

The following is an example:


Configuring APIC for TACACS+ Access

Before you begin

  • The Cisco Application Centric Infrastructure (ACI) fabric is installed, Application Policy Infrastructure Controllers (APICs) are online, and the APIC cluster is formed and healthy.

  • The TACACS+ server host name or IP address, port, and key are available.

  • The APIC management endpoint group is available.

Procedure


Step 1

In the APIC, create the TACACS+ Provider.

  1. On the menu bar, choose .

  2. In the Navigation pane, choose .

  3. In the Work pane, choose .

  4. Specify the TACACS+ host name (or IP address), port, authorization protocol, key, and management endpoint group.

    Note 

    If the APIC is configured for in-band management connectivity, out-of-band management does not work for authentication. With the APIC release(1x), you can set a global toggle between In-band and out-of-band as the default management connectivity between the APIC server and other external management devices.

    For toggling in-band or out-of-band management in the APIC GUI:

    • Prior to Release (1x): In the Navigation pane, choose . In the Work Pane select either inband or ooband.

    • For Release (x) and (x): In the Navigation pane, choose . In the Work Pane select either inband or ooband.

    • For Release (1x) or later: In the Navigation pane, choose . In the Work Pane select either inband or ooband.

Step 2

Create the Login Domain for TACACS+.

  1. In the Navigation pane, choose .

  2. In the Work pane, choose .

  3. Specify the login domain name, description, realm, and provider group as appropriate.


What to do next

This completes the APIC TACACS+ configuration steps. Next, if a RAIDUS server will also be used, configure the APIC for RADIUS. If only a TACACS+ server will be used, go to the ACS server configuration topic below.

Configuring APIC for RADIUS Access

Before you begin

  • The ACI fabric is installed, Application Policy Infrastructure Controllers (APICs) are online, and the APIC cluster is formed and healthy.

  • The RADIUS server host name or IP address, port, authorization protocol, and key are available.

  • The APIC management endpoint group is available.

Procedure


Step 1

In the APIC, create the RADIUS provider.

  1. On the menu bar, choose .

  2. In the Navigation pane, click on Authentication and then click on the RADIUS tab.

  3. In the Work pane, choose .

  4. Specify the RADIUS host name (or IP address), port, protocol, and management endpoint group.

    Note 

    If the APIC is configured for in-band management connectivity, out-of-band management does not work for authentication. With the APIC release(1x), you can set a global toggle between In-band and out-of-band as the default management connectivity between the APIC server and other external management devices.

    For toggling in-band or out-of-band management in the APIC GUI:

    • Prior to Release (1x): In the Navigation pane, choose . In the Work Pane select either inband or ooband.

    • For Release (x) and (x): In the Navigation pane, choose . In the Work Pane select either inband or ooband.

    • For Release (1x) or later: In the Navigation pane, choose . In the Work Pane select either inband or ooband.

Step 2

Create the login domain for RADIUS.

  1. In the Navigation pane, choose .

  2. In the Work pane, choose .

  3. Specify the login domain name, description, realm, and provider group as appropriate.


What to do next

This completes the APIC RADIUS configuration steps. Next, configure the RADIUS server.

Configuring a Cisco Secure Access Control Server for RADIUS and TACACS+ Access to the APIC

Before you begin

  • The Cisco Secure Access Control Server (ACS) version is installed and online.


    Note

    ACS v was used to document these steps. Other versions of ACS might support this task but the GUI procedures might vary accordingly.


  • The Cisco Application Policy Infrastructure Controller (Cisco APIC) RADIUS or TACACS+ keys are available (or keys for both if both will be configured).

  • The APICs are installed and online; the APIC cluster is formed and healthy.

  • The RADIUS or TACACS+ port, authorization protocol, and key are available.

Procedure


Step 1

Log in to the ACS server to configure the APIC as a client.

  1. Navigate to .

  2. Specify the client name, the APIC in-band IP address, select the TACACS+ or RADIUS (or both) authentication options.

    Note 

    If the only RADIUS or TACACS+ authentication is needed, select only the needed option.

  3. Specify the authentication details such as Shared Secret (key), and port as appropriate for the authentication option(s).

    Note 

    The Shared Secret(s) must match the APIC Provider key(s).

Step 2

Create the Identity Group.

  1. Navigate to option.

  2. Specify the Name, and Parent Group as appropriate.

Step 3

Map users to the Identity Group.

  1. In the Navigation pane, click the option.

  2. Specify the user Name, and Identity Group as appropriate.

Step 4

Create the Policy Element.

  1. Navigate to the Policy Elements option.

  2. For RADIUS, specify the Authorization and Permissions > Network Access > Authorization Profiles Name. For TACACS+, specify the Authorization and Permissions > Device Administration > Shell Profile Name as appropriate.

  3. For RADIUS, specify the Attribute as , Type as string, and the Value as as appropriate. For TACACS+, specify the Attribute as , Requirement as Mandatory, and the Value as as appropriate.

    The syntax of the Value field determines whether write privileges are granted:

    • For read/write privileges, the syntax is .

    • For read-only privileges, the syntax is .

    For example, if the has a value of , then is the security domain, is the role that gives write privileges to this user in the security domain called , is the tenant common, and is the role with read privileges that gives this user read privileges to all of the tenant common.

Step 5

Create a service selection rule.

  1. For RADIUS, create a service selection rule to associate the Identity Group with the Policy Element by navigating to and specifying the rule Name, Status, and Conditions as appropriate, and Add the.

  2. For TACACS+, create a service selection rule to associate the Identity Group with the Shell Profile by navigating to . Specify the rule Name, Conditions, and Select the Shell Profile as appropriate.


What to do next

Use the newly created RADIUS and TACACS+ users to log in to the APIC. Verify that the users have access to the correct APIC security domain according to the assigned RBAC roles and privileges. The users should not have access to items that have not been explicitly permitted. Read and write access rights should match those configured for that user.

Configuring Windows Server LDAP for APIC Access with Cisco AVPair

Before you begin

  • First, configure the LDAP server, then configure the Cisco Application Policy Infrastructure Controller (Cisco APIC) for LDAP access.

  • The Microsoft Windows Server is installed and online.

  • The Microsoft Windows Server Server Manager ADSI Edit tool is installed. To install ADSI Edit, follow the instructions in the Windows Server Server Manager help.

  • attribute specifications: Common Name = , LDAP Display Name = , Unique X Object ID = , Description = , Syntax = .


    Note

    For LDAP configurations, best practice is to use as the attribute string. If customer faces the issue using Object ID , an additional Object ID can also be used in the LDAP server.


  • A Microsoft Windows Server user account is available that will enable the following:

    • Running ADSI Edit to add the attribute to the Active Directory (AD) Schema.

    • Configuring an Active Directory LDAP user to have attribute permissions.

  • Port is required for configuring LDAP integration with SSL/TLS.

Procedure


Step 1

Log in to an Active Directory (AD) server as a domain administrator.

Step 2

Add the attribute to the AD schema.

  1. Navigate to , type and press Enter.

    The Microsoft Management Console (MMC) opens.
  2. Navigate to .

  3. In the Add Standalonee Snap-in dialog box, select the Active Directory Schema and click Add.

    The MMC Console opens.
  4. Right-click the Attributes folder, select the Create Attribute option.

    The Create New Attribute dialog box opens.
  5. Enter for the Common Name , for the LDAP Display Name, for the Unique X Object ID, and select for the Syntax.

  6. Click OK to save the attribute.

Step 3

Update the User Properties class to include the CiscoAVPair attribute.

  1. In the MMC Console, expand the Classes folder, right-click the user class, and choose Properties.

    The user Properties dialog box opens.
  2. Click the Attributes tab, and click Add to open the Select Schema Object window.

  3. In the Select a schema object: list, choose , and click Apply.

  4. In the MMC Console, right-click the Active Directory Schema, and select Reload the Schema.

Step 4

Configure the attribute permissions.

Now that the LDAP includes the attributes, LDAP users need to be granted Cisco APIC permission by assigning them Cisco APIC RBAC roles.

  1. In the ADSI Edit dialog box, locate a user who needs access to the Cisco APIC.

  2. Right-click on the user name, and choose Properties.

    The <user> Properties dialog box opens.
  3. Click the Attribute Editor tab, select the attribute, and enter the as .

    For example, if the has a value of , then is the security domain, is the role for this user that gives write privileges to this user in the security domain called , is the Cisco Application Centric Infrastructure (Cisco ACI) tenant common, and is the role with read privileges that gives this user read privileges to all of the Cisco ACI tenant common.

  4. Click OK to save the changes and close the <user> Properties dialog box.


The LDAP server is configured to access the Cisco APIC.

What to do next

Configure the Cisco APIC for LDAP access.

Configuring APIC for LDAP Access

Before you begin

  • The Cisco Application Centric Infrastructure (ACI) fabric is installed, Application Policy Infrastructure Controllers (APICs) are online, and the APIC cluster is formed and healthy.

  • The LDAP server host name or IP address, port, bind DN, Base DN, and password are available.

  • The APIC management endpoint group is available.

Procedure


Step 1

In the APIC, configure the LDAP Provider.

  1. On the menu bar, choose .

  2. In the Navigation pane, choose Authentication and in the Work pane click on the tab.

  3. In the Work pane, choose .

  4. Specify the LDAP host name (or IP address), port, bind DN, base DN, password, attribute, and management endpoint group.

    Note 
    • The bind DN is the string that the APIC uses to log in to the LDAP server. The APIC uses this account to validate the remote user attempting to log in. The base DN is the container name and path in the LDAP server where the APIC searches for the remote user account. This is where the password is validated. Filter is used to locate the attribute that the APIC requests to use for the . This contains the user authorization and assigned RBAC roles for use on the APIC. The APIC requests the attribute from the LDAP server.

    • Attribute field—Enter one of the following:

      • For LDAP server configurations with a Cisco AVPair, enter .

      • For LDAP server configurations with an LDAP group map, enter .

    • If the APIC is configured for in-band management connectivity, choosing an out-of-band management endpoint group for LDAP access does not take effect. Alternatively, an out-of-band over an in-band management endpoint group can connect a LDAP server, but requires configuring a static route for the LDAP server. The sample configuration procedures in this document use an APIC in-band management endpoint group.

Step 2

On the APIC, configure the login domain for LDAP.

  1. In the Navigation pane, choose .

  2. In the Work pane, choose .

  3. Specify the login domain name, description, realm, and provider group as appropriate.


What to do next

This completes the APIC LDAP configuration steps. Next, test the APIC LDAP login access.

Changing the Default Behavior for Remote Users with Missing or Bad Cisco AV Pairs

Procedure


Step 1

On the menu bar, click .

Step 2

In the Navigation pane, click Users.

Step 3

In the Work pane, in the Remote Users area, from the Remote user login policy drop-down list, choose Assign Default Role.

The default value is No Login. The Assign Default Role option assigns the minimal read-only privileges to users that have missing or bad Cisco AV Pairs. Bad AV Pairs are those AV Pairs that fail the parsing rules.


About Signature-Based Transactions

The APIC controllers in a Cisco ACI fabric offer different methods to authenticate users.

The primary authentication method uses a username and password and the APIC REST API returns an authentication token that can be used for future access to the APIC. This may be considered insecure in a situation where HTTPS is not available or enabled.

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Washington Monument is located in the District of Columbia
Washington Monument

Washington Monument (the District of Columbia)

Show map of the District of Columbia
Washington Monument is located in the United States
Washington Monument

Washington Monument (the United States)

Show map of the United States

The Washington Monument is an obelisk within the National Mall in Washington, D.C., built to commemorate George Washington, once commander-in-chief of the Continental Army (–) in the American Revolutionary War and the first President of the United States (–). Located almost due east of the Reflecting Pool and the Lincoln Memorial,[2] the monument, made of marble, granite, and bluestone gneiss,[3] is both the world's tallest predominantly stone structure and the world's tallest obelisk,[A] standing &#;feet 7+11&#;32&#;inches (&#;m) tall according to the U.S. National Geodetic Survey (measured –14) or &#;feet 5+1&#;8&#;inches (&#;m) tall, according to the National Park Service (measured ).[B] It is the tallest monumental column in the world if all are measured above their pedestrian entrances.[A] Overtaking the Cologne Cathedral, it was the tallest structure in the world between and , after which it was overtaken by the Eiffel Tower in Paris.

Construction of the presidential memorial began in and was halted for a period of 23 years, from to due to a lack of funds, a struggle for control over the Washington National Monument Society, and the American Civil War. Although the stone structure was completed in , internal ironwork, the knoll, and installation of memorial stones were not completed until A difference in shading of the marble, visible approximately feet (46&#;m) or 27% up, shows where construction was halted and later resumed with marble from a different source. The original design was by Robert Mills (–) of South Carolina, but he did not include his proposed colonnade due to a lack of funds, proceeding only with a bare obelisk. The cornerstone was laid on July 4, ; the first stone was laid atop the unfinished stump on August 7, ; the capstone was set on December 6, ; the completed monument was dedicated on February 21, ;[14] and officially opened October 9,

The Washington Monument is a hollow Egyptian style stone obelisk with a foot (&#;m) tall column surmounted by a foot (&#;m) tall pyramidion. Its walls are 15 feet (&#;m) thick at its base and 1+1&#;2 feet (&#;m) thick at their top. The marble pyramidion has thin walls only 7 inches (18&#;cm) thick supported by six arches, two between opposite walls that cross at the center of the pyramidion and four smaller corner arches. The top of the pyramidion is a large marble capstone with a small aluminum pyramid at its apex with inscriptions on all four sides. The lowest feet (&#;m) of the walls, constructed during the first phase –, are composed of a pile of bluestone gneiss rubble stones (not finished stones) held together by a large amount of mortar with a facade of semi-finished marble stones about 1+1&#;4 feet (&#;m) thick. The upper feet (&#;m) of the walls, constructed during the second phase –, are composed of finished marble surface stones, half of which project into the walls, partially backed by finished granite stones.[15]

The interior is occupied by iron stairs that spiral up the walls, with an elevator in the center, each supported by four iron columns, which do not support the stone structure. The stairs contain fifty sections, most on the north and south walls, with many long landings stretching between them along the east and west walls. These landings allowed many inscribed memorial stones of various materials and sizes to be easily viewed while the stairs were accessible (until ), plus one memorial stone between stairs that is difficult to view. The pyramidion has eight observation windows, two per side, and eight red aircraft warning lights, two per side. Two aluminum lightning rods, connected via the elevator support columns to ground water, protect the monument. The monument's present foundation is 37 feet (&#;m) thick, consisting of half of its original bluestone gneiss rubble encased in concrete. At the northeast corner of the foundation, 21 feet (&#;m) below ground, is the marble cornerstone, including a zinc case filled with memorabilia.[15] Fifty American flags fly on a large circle of poles centered on the monument.[16] In , a temporary screening facility was added to the entrance to prevent a terrorist attack.[17] An earthquake in slightly damaged the monument, and it was closed until [18] It was closed again for elevator system repairs, security upgrades, and mitigation of soil contamination from August to September

History[edit]

Rationale[edit]

George Washington (–), hailed as the father of his country, and as the leader who was "first in war, first in peace and first in the hearts of his countrymen" (in eulogy by Maj. Gen. 'Light-Horse Harry' Lee at Washington's funeral, December 26, ), was the dominant military and political leader of the new United States of America from to Even his former enemy King George III called him "the greatest character of the age".[19]

At his death in , he left a critical legacy: Washington was the unchallenged public icon of American military and civic patriotism. He was also identified with the Federalist Party, which lost control of the national government in to the Jeffersonian Republicans, who were reluctant to celebrate the hero of the opposition party.[20]

Proposals for a memorial[edit]

Starting with victory in the Revolution, there were many proposals to build a monument to Washington, beginning with an authorization in by the old Confederation Congress to erect an equestrian statue of the General in a future American national capital city. After his December death, the United States Congress authorized a suitable memorial in the planned national capital then under construction since , but the decision was reversed when the Democratic-Republican Party (Jeffersonian Republicans) took control of Congress in after the pivotal Election, with the first change of power between opposing political parties.[21] The Republicans were dismayed that Washington had become the symbol of the Federalist Party; furthermore the values of Republicanism seemed hostile to the idea of building monuments to powerful men. They also blocked his image on coins or the celebration of his birthday. Further political squabbling, along with the North–South division on the Civil War, blocked the completion of the Washington Monument until the late 19th century. By that time, Washington had the image of a national hero who could be celebrated by both North and South, and memorials to him were no longer controversial.[22]

As early as , the old Confederation Congress (successors after to the earlier Second Continental Congress) had resolved "That an equestrian statue of George Washington be erected at the place where the residence of Congress shall be established". The proposal called for engraving on the statue which explained it had been erected "in honor of George Washington, the illustrious Commander-in-Chief of the Armies of the United States of America during the war which vindicated and secured their liberty, sovereignty, and independence".[23] Currently, there are two equestrian statues of President Washington in the national capital city of Washington, D.C. One is located in Washington Circle at the intersection of the Foggy Bottom and West End neighborhoods at the north end of the George Washington University campus, and the other is in the gardens of the National Cathedral of the Episcopal Church on Mount St. Alban in northwest Washington.

On December 24, , 10 days after Washington's death, a U.S. Congressional committee recommended a different type of monument. John Marshall (–), a Representative from Virginia (who later became Chief Justice of the United States, –) proposed that a tomb be erected within the Capitol and it was designed later to place such a crypt sepulchre below the rotunda of the great dome. However, a lack of funds, disagreement over what type of memorial would best honor the country's first president, and the Washington family's reluctance to move his body from Mount Vernon prevented progress on any project.[24]

Design[edit]

Print of the proposed Washington Monument by architect Robert Mills(–), Proposed Plan circa –

Progress toward a memorial finally began in That year a large group of citizens formed the Washington National Monument Society. Three years later, in , after they had raised $28, in donations (equivalent to $1,, in ), they announced a competition for the design of the memorial.[25]:&#;chp 1&#;

On September 23, , the board of managers of the society described their expectations:[26]

It is proposed that the contemplated monument shall be like him in whose honor it is to be constructed, unparalleled in the world, and commensurate with the gratitude, liberality, and patriotism of the people by whom it is to be erected&#; [It] should blend stupendousness with elegance, and be of such magnitude and beauty as to be an object of pride to the American people, and of admiration to all who see it. Its material is intended to be wholly American, and to be of marble and granite brought from each state, that each state may participate in the glory of contributing material as well as in funds to its construction.

The society held a competition for designs in In , the winner was announced to be architect Robert Mills, supposedly the first native-born American to be professionally trained as an architect.[6]:&#;2–2&#; The citizens of Baltimore had chosen him in to build one of the first monuments to George Washington originally planned for the former courthouse square in their port city, and he had designed a tall elaborately decorated Greek column with balconies, surmounted by a statue of the President. Mills' Baltimore monument, with cornerstone laid and construction begun in , was later simplified to a plain column shaft with a statue of a toga-clad Washington at the top when it was completed in , but moved (because of its height) to the then rural hills to the north, where the city's growth would later extend. Mills also knew the capital well, with its being only 40 miles (65 kilometers) southwest of Baltimore, and his having just been chosen Architect of Public Buildings for Washington. His design called for a circular colonnaded building feet (76&#;m) in diameter and feet (30&#;m) high from which sprang a four-sided obelisk feet (&#;m) high, for a total elevation of feet (&#;m). A massive cylindrical pillar 70 feet (21&#;m) in diameter supported the obelisk at the center of the building. The obelisk was to be 70 feet (21&#;m) square[C] at the base and 40 feet (12&#;m) square at the top with a slightly peaked roof. Both the obelisk and pillar were hollow within which a railway spiraled up. The obelisk had no doorway—instead its interior was entered from the interior of the pillar upon which it was mounted. The pillar had an "arched way" at its base. The top of the portico of the building would feature Washington standing in a chariot holding the reins of six horses. Inside the colonnade would be statues of 30 prominent Revolutionary War heroes as well as statues of the 56 signers of the Declaration of Independence.[27]:&#;6–8&#;[15]:&#;13&#;[28]:&#;26–28&#;

Criticism of Mills's design and its estimated price tag of more than $1&#;million (in money, equivalent to $20,, in ) caused the society to hesitate. On April 11, , the society decided, due to a lack of funds, to build only a simple plain obelisk. Mills's obelisk was to be feet tall, 55 feet (17&#;m) square at the base and 35 feet (11&#;m) square at the top. It had two massive doorways, each 15 feet (&#;m) high and 6 feet (&#;m) wide, on the east and west sides of its base.[15]:&#;15,&#;21&#; Surrounding each doorway were raised jambs, a heavy pediment, and entablature within which was carved an Egyptian-style winged sun and asps.[29][15]:&#;23&#;[28]:&#;+&#; Some of these details can be seen in the photograph below at Donations run out, after clicking on the image and viewing the original file at its highest magnification. This original design conformed to a massive temple which was to have surrounded the base of the obelisk, but because it was never built, the architect of the second phase of construction Thomas Lincoln Casey smoothed down the projecting jambs, pediment and entablature in , walled up the west entrance with marble forming an alcove, and reduced the east entrance to 8 feet (&#;m) high.[30][15]:&#;90–91&#; The western alcove has contained a bronze statue of Washington since – Also during –93 a limestone surround was installed at the east elevator entrance decorated with a winged sun and asps to mimic Mills's design.

Construction[edit]

West side of Jefferson Pier with Washington Monument in background

The Washington Monument was originally intended to be located at the point at which a line running directly south from the center of the White House crossed a line running directly west from the center of the U.S. Capitol on Capitol Hill. French born and military engineer Pierre (Peter) Charles L'Enfant's visionary "Plan of the city intended for the permanent seat of the government of the United States&#;" designated this point as the location of the proposed central equestrian statue of George Washington that the old Confederation Congress had voted for in , at the end of the American Revolutionary War (–) in a future American national capital city.[31][D] The ground at the intended location proved to be too unstable to support a structure as heavy as the planned obelisk, so the monument's location was moved feet (&#;m) east-southeast.[E] At that originally intended site there now stands a small monolith called the Jefferson Pier.[36][37] This offset caused the McMillan Plan to specify that the Lincoln Memorial should be "placed on the main axis of the Capitol and the Monument", about 1° south of due west of the Capitol or the monument, not due west of the Capitol or the monument.[38][F]

Excavation and initial construction[edit]

Construction of the monument finally began three years later in with the excavation of the site, the laying of the cornerstone on the prepared bed, and laying the original foundation around and on top of the cornerstone, before the construction of its massive walls began the next year. Regarding modern claims of slave labor being used in construction, Washington Monument Historian John Steele Gordon stated "I can't say for certain, but the stonemasonry was pretty highly skilled, so it's unlikely that slaves would've been doing it. The stones were cut by stonecutters, which is highly skilled work; and the stones were hoisted by means of steam engines, so you'd need a skilled engineer and foreman for stuff like that. Tending the steam engine, building the cast-iron staircase inside—that wasn't grunt work. The early quarries were in Maryland, so slave labor was undoubtedly used to quarry and haul the stone"[39] Abraham Riesman, who quoted Gordon, states "there were plenty of people who worked as skilled laborers while enslaved in antebellum America. Indeed, there were enslaved people who worked as stonemasons. So the possibility remains that there were slaves who performed some of the necessary skilled labor for the monument."[39] According to historian Jesse Holland, it is very likely that African-American slaves were among the construction workers, given that slavery prevailed in Washington and its surrounding states at that time, and slaves were commonly used in public and private construction.[40]

Gordon's arguments are valid for the second phase (–) after slavery was abolished, when every stone laid required dressing and polishing by a skilled stonemason. This includes the iron staircase which was constructed – That the stonecutters in the quarry were slaves is confirmed because all quarry workers were slaves during the construction of the United States Capitol during the s.[41]:&#;5–6&#; However, Holland's views are valid for the first phase because most of its construction only required unskilled manual labor. No information survives concerning the method used to lift stones that weighed several tons each during the first phase, whether by a manual winch or a steam engine.[15]:&#;17–23&#; The surviving information concerning slaves that built the core of the United States Capitol during the s is not much help. At the time, the District of Columbia outside of Georgetown was sparsely populated so the federal government rented slaves from their owners who were paid a fee for their slaves' normal daily labor. Any overtime for Sundays, holidays, and nights was paid directly to the slaves which they could use for daily needs or to save to buy their freedom.[41]:&#;9&#; Conversely, the first phase of the monument was constructed by a private entity, the Washington National Monument Society, which may not have been as magnanimous as the federal government, but most information was lost during the s while two Societies vied for control of the monument. Useful information concerning the use of slaves during the major expansion of the Capitol during the s, nearly contemporaneous with the monument's first phase, does not exist.

Only a small number of stones used in the first phase required a skilled stonemason, the marble blocks on the outer surface of the monument (their inner surfaces were left very rough) and those gneiss stones that form the rough inner walls of the monument (all other surfaces of those inner stones within the walls were left jagged). The vast majority of all gneiss stones laid during the first phase, those between the outer and inner surfaces of the walls, from very large to very small jagged stones, form a pile of rubble held together by a large amount of mortar. The top surface of this rubble can be seen below at Walls in an drawing made just before the polished/rough marble and granite stones used in the second phase were laid atop it. The original foundation below the walls was made of layered gneiss rubble, but without the massive stones used within the walls. Most of the gneiss stones used during the first phase were obtained from quarries in the upper Potomac River Valley. Almost all the marble stones of the first and second phases came from two Maryland quarries about 20 miles (30&#;km) north of downtown Baltimore in rural Baltimore County where stone for their first Washington Monument was obtained.

On Independence Day, July 4, , the Freemasons, the same organization to which Washington belonged, laid the cornerstone (symbolically, not physically).[28]:&#;45,&#;–&#; According to Joseph R. Chandler:[28]:&#;,&#;–&#;[42]

No more Washingtons shall come in our time But his virtues are stamped on the heart of mankind. He who is great in the battlefield looks upward to the generalship of Washington. He who grows wise in counsel feels that he is imitating Washington. He who can resign power against the wishes of a people, has in his eye the bright example of Washington.[42]

Two years later, on a torrid July 4, , George Washington Parke Custis (–), the adopted son of George Washington and grandson of Martha Washington (–), dedicated a stone from the people of the District of Columbia to the Monument at a ceremony that 12th President Zachary Taylor (–, served –) attended, just five days before he died from food poisoning.[43]

Donations run out[edit]

The partially completed monument, photographed by Mathew Brady; circa

Construction continued until , when donations ran out and the monument had reached a height of feet (&#;m). At that time a memorial stone that was contributed by Pope Pius IX, called the Pope's Stone, was destroyed by members of the anti-Catholic, nativist American Party, better known as the "Know-Nothings", during the early morning hours of March 6, (a priest replaced it in using the Latin phrase "A Roma Americae" instead of the original stone's English phrase "Rome to America"). Economic and political conditions of the time caused public contributions to the Washington National Monument Society to cease, so they appealed to Congress for money.[15]:&#;23,&#;25–26&#;[44]:&#;16,&#;,&#;–3&#;

The request had just reached the floor of the House of Representatives when the Know-Nothing Party seized control of the Society on February 22, , a year after construction funds ran out. Congress immediately tabled its expected contribution of $, to the Society, effectively halting the Federal appropriation. During its tenure, the Know-Nothing Society added only two courses of masonry, or four feet, to the monument using rejected masonry it found on site, increasing the height of the shaft to feet. The original Society refused to recognize the takeover, so the two rival Societies existed side by side until With the Know-Nothing Party disintegrating and unable to secure contributions for the monument, it surrendered its possession of the monument to the original Society three and a half years later on October 20, To prevent future takeovers, the U.S. Congress incorporated the Society on February 22, with a stated charter and set of rules and procedures.[25]:&#;chp 3&#;[28]:&#;52–65&#;

Post–Civil War[edit]

The American Civil War (–), halted all work on the monument, but interest grew after the war's end. Engineers studied the foundation several times to determine if it was strong enough for continued construction after 20 years of effective inactivity. In , the American Centennial of the Declaration of Independence, Congress agreed to appropriate another $, to resume construction.[45]

Before work could begin again, arguments about the most appropriate design resumed. Many people thought a simple obelisk, one without the colonnade, would be too bare. Architect Mills was reputed to have said omitting the colonnade would make the monument look like "a stalk of asparagus"; another critic said it offered "little&#; to be proud of".[24]

Monument plans and timeline of construction

This attitude led people to submit alternative designs. Both the Washington National Monument Society and Congress held discussions about how the monument should be finished. The Society considered five new designs, concluding that the one by William Wetmore Story (–), seemed "vastly superior in artistic taste and beauty". Congress deliberated over those five as well as Mills's original. While it was deciding, it ordered work on the obelisk to continue. Finally, the members of the society agreed to abandon the colonnade and alter the obelisk so it conformed to classical Egyptian proportions.[26]

Resumption[edit]

Construction resumed in under the direction of Lieutenant Colonel Thomas Lincoln Casey of the United States Army Corps of Engineers. Casey redesigned the foundation, strengthening it so it could support a structure that ultimately weighed more than 40, tons. The first stone atop the unfinished stump was laid on August 7, , in a small ceremony attended by President Rutherford B. Hayes, Casey and a few others. The president placed a small coin on which he had scratched his initials and the date in the bed of wet cement at the foot level before the first stone was laid on top of it.[15]:&#;76&#; Casey found 92 memorial stones ("presented stones") already inlaid into the interior walls of the first phase of construction. Before construction continued he temporarily removed eight stones at the foot level so that the walls at that level could be sloped outward, producing thinner second-phase walls. He inserted those stones and most of the remaining memorial stones stored in the lapidarium into the interior walls during –[44]:&#;11–17&#; The bottom third of the monument is a slightly lighter shade than the rest of the construction because the marble was obtained from different quarries.[46]

P. H. McLaughlin setting the aluminum apex with Thomas Lincoln Casey (hands up)
The Washington Monument almost complete around

The building of the monument proceeded quickly after Congress had provided sufficient funding. In four years, it was completed, with the ounce (&#;kg) aluminum apex/lightning-rod being put in place on December 6, [45] The apex was the largest single piece of aluminum cast at the time, when aluminum commanded a price comparable to silver.[10] Two years later, the Hall–Héroult process made aluminum easier to produce and the price of aluminum plummeted, though it should have provided a lustrous, non-rusting apex.[G][47] The monument opened to the public on October 9, [48]

Dedication[edit]

The Monument was dedicated on February 21, [14] Over people were present on the monument grounds to hear speeches during a frigid day by Ohio Senator John Sherman (–), the Rev. Henderson Suter, William Wilson Corcoran (of the Washington National Monument Society) read by Dr. James C. Welling because Corcoran was unable to attend, Freemason Myron M. Parker, Col. Thomas Lincoln Casey of the Army Corps of Engineers, and President Chester A. Arthur.[45][28]:&#;&#;[49] President Arthur proclaimed:

I do now in behalf of the people, receive this monument and declare it dedicated from this time forth to the immortal name and memory of George Washington.[49]

After the speeches Lieutenant-General Philip Sheridan (–), Civil War Cavalry veteran and then General-in-Chief of the United States Army led a procession, which included the dignitaries and the crowd, past the Executive Mansion, now the White House, then via Pennsylvania Avenue to the east main entrance of the Capitol, where 21st President Chester Arthur (–, served –) received passing troops. Then, in the House of Representatives Chamber at the U.S. Capitol, the president, his Cabinet, diplomats and others listened to Representative John Davis Long (–), (former Lieutenant Governor and Governor of Massachusetts and future Secretary of the Navy) read a speech written a few months earlier by Robert C. Winthrop (–), formerly the Speaker of the House of Representatives when the cornerstone was laid 37 years earlier in , but now too ill to personally deliver his speech.[28]:&#;–&#; A final speech was given by John W. Daniel (–), of Virginia, a well-regarded lawyer, author and Representative (congressman), and Senator. The festivities concluded that evening with fireworks, both aerial and ground displays.[28]:&#;–&#;[50][51]

Later history[edit]

Diagram of the Principal High Buildings of the Old World, The Washington Monument is the tallest structure represented.

At completion, it was the tallest building in the world, until the Eiffel Tower was completed four years later in Paris in It is still the tallest building in Washington, D.C.[52][53] The Heights of Buildings Act of restricts new building heights to no more than 20 feet (&#;m) greater than the width of the adjacent street.[54] This monument is taller than the obelisks around the capitals of Europe and in Egypt and Ethiopia, but ordinary antique obelisks were quarried as a monolithic block of stone, and were therefore seldom taller than approximately feet (30&#;m).[55]

The Washington Monument attracted enormous crowds before it officially opened. For six months after its dedication, 10, people climbed the steps and 47 large landings to the top. After the elevator that had been used to raise building materials was altered to carry passengers, the number of visitors grew rapidly, and an average of 55, people per month were going to the top by , only three years after its completion and dedication.[56] The annual visitor count peaked at an average of &#;million people between and From to , when restrictions were placed on the number of visitors allowed per day, the Washington Monument had an annual average of , visitors.[57] As with all historic areas administered by the National Park Service (an agency of the U.S. Department of the Interior), the national memorial was listed on the National Register of Historic Places on October 15, [58]

In the early s, material started oozing out between the outer stones of the first construction period below the foot mark, and was referred to by tourists as "geological tuberculosis". This was caused by the weathering of the cement and rubble filler between the outer and inner walls. As the lower section of the monument was exposed to cold and hot and damp and dry weather conditions, the material dissolved and worked its way through the cracks between the stones of the outer wall, solidifying as it dripped down their outer surface.[59]

The monument undergoing restoration in

For ten hours in December , the Washington Monument and eight tourists were held hostage by a nuclear arms protester, Norman Mayer, claiming to have explosives in a van he drove to the monument's base. United States Park Police shot and killed Mayer. The monument was undamaged in the incident, and it was discovered later that Mayer did not have explosives. After this incident, the surrounding grounds were modified in places to restrict the possible unauthorized approach of motor vehicles.[60]

The monument underwent an extensive restoration project between the years of and During this time it was completely covered in scaffolding designed by the American architect Michael Graves (who was also responsible for the interior changes).[61] The project included cleaning, repairing and repointing the monument's exterior and interior stonework. The stone in publicly accessible interior spaces was encased in glass to prevent vandalism, while new windows with narrower frames were installed (to increase the viewing space). New exhibits celebrating the life of George Washington, and the monument's place in history, were also added.[62]

A temporary interactive visitor center, dubbed the "Discovery Channel Center" was also constructed during the project. The center provided a simulated ride to the top of the monument, and shared information with visitors during phases in which the monument was closed.[63] The majority of the project's phases were completed by summer , allowing the monument to reopen July 31, [62] The monument temporarily closed again on December 4, , to allow a new elevator cab to be installed, completing the final phase of the restoration project. The new cab included glass windows, allowing visitors to see some of the memorial stones with their inscriptions embedded in the monument's walls. The installation of the cab took much longer than anticipated, and the monument did not reopen until February 22, The final cost of the restoration project was $&#;million.[64]

On September 7, , the monument closed for a $15&#;million renovation, which included numerous security upgrades and redesign of the monument grounds by landscape architect Laurie Olin (b. ). The renovations were due partly to security concerns following the September 11, attacks and the start of the War on Terror. The monument reopened April 1, , while the surrounding grounds remained closed until the landscape was finished later that summer.[65][66]

earthquake damage[edit]

Repairing the Washington Monument

Repairs on the Washington Monument in

On August 23, , the Washington Monument sustained damage during the magnitude Virginia earthquake;[67] over cracks were found in the monument.[68] A National Park Service spokesperson reported that inspectors discovered a crack near the top of the structure, and announced that the monument would be closed indefinitely.[69][70] A block in the pyramidion also was partially dislodged, and pieces of stone, stone chips, mortar, and paint chips came free of the monument and "littered" the interior stairs and observation deck.[71] The Park Service said it was bringing in two structural engineering firms (Wiss, Janney, Elstner Associates, Inc. and Tipping Mar Associates) with extensive experience in historic buildings and earthquake-damaged structures to assess the monument.[72]

Officials said an examination of the monument's exterior revealed a "debris field" of mortar and pieces of stone around the base of the monument, and several "substantial" pieces of stone had fallen inside the memorial.[70] A crack in the central stone of the west face of the pyramidion was 1 inch (&#;cm) wide and 4 feet (&#;m) long.[73][74] Park Service inspectors also discovered that the elevator system had been damaged, and was operating only to the foot (76&#;m) level, but was soon repaired.[75]

On September 27, , Denali National Park ranger Brandon Latham arrived to assist four climbers belonging to a "difficult access" team from Wiss, Janney, Elstner Associates.[70][74] The reason for the inspection was the park agency's suspicion that there were more cracks on the monument's upper section not visible from the inside. The agency said it filled the cracks that occurred on August After Hurricane Irene hit the area on August 27, water was discovered inside the memorial, leading the Park Service to suspect there was more undiscovered damage.[70] The rappellers used radios to report what they found to engineering experts on the ground.[76] Wiss, Janney, Elstner climber Dave Megerle took three hours to set up the rappelling equipment and set up a barrier around the monument's lightning rod system atop the pyramidion;[73] it was the first time the hatch in the pyramidion had been open since [73]

The external inspection of the monument was completed on October 5, In addition to the 4-foot (&#;m) long west crack, the inspection found several corner cracks and surface spalls (pieces of stone broken loose) at or near the top of the monument, and more loss of joint mortar lower down the monument. The full report was issued in December [18] Bob Vogel, Superintendent of the National Mall and Memorial Parks, emphasized that the monument was not in danger of collapse. "It's structurally sound and not going anywhere", he told the national media at a press conference on September 26, [74]

More than $, was spent between August 24 and September 26 inspecting the structure.[70] The National Park Service said that it would soon begin sealing the exterior cracks on the monument to protect it from rain and snow.[76][77]

On July 9, , the National Park Service announced that the monument would be closed for repairs until [78] The National Park Service hired construction management firm Hill International in conjunction with joint-venture partner Louis Berger Group to provide coordination between the designer, Wiss, Janney, and Elstner Associates, the general contractor Perini, and numerous stakeholders.[79] NPS said a portion of the plaza at the base of the monument would be removed and scaffolding constructed around the exterior. In July , lighting was added to the scaffolding.[80] Some stone pieces saved during the inspection would be refastened to the monument, while "Dutchman patches"[H] would be used in other places. Several of the stone lips that help hold the pyramidion's 2,pound (&#;kg) exterior slabs in place were also damaged, so engineers installed stainless steel brackets to more securely fasten them to the monument.[82]

The National Park Service reopened the Washington Monument to visitors on May 12, , eight days ahead of schedule.[83][79] Repairs to the monument cost $15&#;million,[68] with taxpayers funding $&#;million of the cost and David Rubenstein funding the other $&#;million.[84] At the reopening Interior Secretary Sally Jewell, Today show weatherman Al Roker, and American IdolSeason 12 winner Candice Glover were present.[85]

Subsequent problems and repairs[edit]

The monument continued to be plagued by problems after the earthquake, including in January when the lights illuminating it went out.[86] The monument was closed again in September due to reliability issues with the elevator system.[87] On December 2, , the National Park Service announced that the monument would be closed until in order to modernize the elevator. The $2–3&#;million project was to correct the elevator's ongoing mechanical, electrical and computer issues, which had shuttered the monument since August The National Park Service requested funding in its FY President's Budget Request to construct a permanent screening facility for the Washington Monument.[88] The final months of closure were for mitigation of possibly contaminated underground soil thought to have been introduced in the s.[89] The monument reopened September 19, [90]

Repeated closures[edit]

After reopening in September , the Washington Monument was closed on March 14, , with the onslaught of the COVID pandemic.[91] It reopened on October 1, ,[92] and remained open through the remainder of that year, except for brief closures.[93]

On January 11, , a few days after the storming of the United States Capitol, the National Park Service announced a two-week closure of the monument until after the presidential inauguration due to "credible threats to visitors and park resources".[94] Following a lack of violence, the closure was extended due to a revival of COVID fears.[95]

The monument then reopened on July 14, ,[92] only to close yet again on August 16 for two weeks due to lightning strikes which damaged some electrical systems.[96] This occurred just a week before the 10th anniversary of the August 23, earthquake and highlighted a decade when the monument was closed more than it was open.

Components[edit]

Cornerstone[edit]

The cornerstone was laid with great ceremony at the northeast corner of the lowest course or step of the old foundation on July 4, Robert Mills, the architect of the monument, stated in September , "The foundations are now brought up nearly to the surface of the ground; the second step being nearly completed, which covers up the corner stone."[15]:&#;20&#; Therefore, the cornerstone was laid below the ground level. In , the ground level was raised 17 feet (&#;m) to the base of the shaft by the addition of a foot (&#;m) wide earthen embankment encircling the reinforced foundation, widened another 30 feet in , and then the knoll was constructed in –[6]:&#;B–B&#;[15]:&#;70,&#;95–96&#; If the cornerstone was not moved during the strengthening of the foundation in –80, its upper surface would now be 21 feet (&#;m) below the pavement just outside the northeast corner of the shaft. It would now be sandwiched between the concrete slab under the old foundation and the concrete buttress completely encircling what remains of the old foundation. During the strengthening process, about half by volume of the periphery of the lowest seven of eight courses or steps of the old foundation (gneiss rubble) was removed to provide good footing for the buttress. Although a few diagrams, pictures and descriptions of this process exist, the fate of the cornerstone is not mentioned.[6]:&#;–,&#;–,&#;–,&#;B–B,&#;figs –,&#;–,&#;,&#;–&#;[15]:&#;67–73&#;

The cornerstone was a 24,pound (11,&#;kg) marble block feet (&#;m) high and feet (&#;m) square with a large hole for a zinc case filled with memorabilia. The hole was covered by a copper plate inscribed with the date of the Declaration of Independence (July 4, ), the date the cornerstone was laid (July 4, ), and the names of the managers of the Washington National Monument Society. The memorabilia in the zinc case included items associated with the monument, the city of Washington, the national government, state governments, benevolent societies, and George Washington, plus miscellaneous publications, both governmental and commercial, a coin set, and a Bible, totaling 73 items or collections of items, as well as 71 newspapers containing articles relating to George Washington or the monument.[25]:&#;app C&#;[28]:&#;pp 43–46,&#;–&#;

The ceremony began with a parade of dignitaries in carriages, marching troops, fire companies, and benevolent societies.[25]:&#;chp 2&#;[28]:&#;44–48&#;[50]:&#;16–17,&#;45–47&#; A long oration was delivered by the Speaker of the House of RepresentativesRobert C. Winthrop.[28]:&#;–&#; Then, the cornerstone was pronounced sound after a Masonic ceremony using George Washington's Masonic gavel, apron and sash, as well as other Masonic symbols. In attendance were President James K. Polk and other federal, state and local government officials, Elizabeth Schuyler Hamilton, Mrs. Dolley Madison, Mrs. John Quincy Adams, and George Washington Parke Custis, among 15, to 20, others, including a bald eagle. The ceremony ended with fireworks that evening.

Memorial stones[edit]

States, cities, foreign countries, benevolent societies, other organizations, and individuals have contributed memorial stones, all inserted into the east and west interior walls above stair landings or levels for easy viewing, except one on the south interior wall between stairs that is difficult to view. The sources disagree on the number of stones for two reasons: whether one or both "height stones" are included, and stones not yet on display at the time of a source's publication cannot be included. The "height stones" refer to two stones that indicate height: during the first phase of construction a stone with an inscription that includes the phrase "from the foundation to this height feet" was installed just below the 80–foot stairway and high above the 60–foot stairway;[7]:&#;sheet 25&#;[44]:&#;52&#; during the second phase of construction a stone with a horizontal line and the phrase "top of statue on Capitol" was installed on the foot level.[7]:&#;sheet 30&#;[97]

The Historic Structure Report (HSR, ) named "memorial stones" by level, including both height stones.[6]:&#;–,&#;5–6,&#;"" on &#; Jacob () described in detail and pictured "commemorative stones", including the foot stone but not the Capitol stone.[44]:&#;"" on 1&#; The Historic American Buildings Survey (HABS, ) showed the location of "memorial stones", but did not describe or name any. HABS showed both height stones, but did not show one stone not yet installed in [7]:&#;sheets 22–25,&#;28–30&#; Olszewski () named "memorial stones" by level, including the Capitol stone but not the foot stone. Olszewski did not include three stones not yet installed in [25]:&#;chp 6,&#;app D,&#;"" in chp 6&#;

Of stones, 94 are marble, 40 are granite, 29 are limestone, 8 are sandstone, with 23 miscellaneous types, including stones with two types of material and those whose materials are not identified.[I] Unusual materials include native copper (Michigan),[44]:&#;&#;pipestone (Minnesota),[44]:&#;&#;petrified wood (Arizona),[44]:&#;&#; and jadeite (Alaska).[44]:&#;&#; The stones vary in size from about feet (&#;m) square (Carthage)[J] to about 6 by 8 feet (&#;m ×&#;&#;m) (Philadelphia and New York City).[44]:&#;3,&#;90,&#;,&#;&#;

Utah contributed one stone as a territory and another as a state, both with inscriptions that include its pre-territorial name, Deseret, both located on the foot level.[44]:&#;–&#;

A stone at the foot level of the monument is inscribed in Welsh: Fy Iaith, Fy Ngwlad, Fy Nghenedl, Cymry am byth (My Language, My Country, My Nation, Welsh forever). The stone, imported from Wales, was donated by Welsh citizens of New York.[44]:&#;&#;[99] Two other stones were presented by the Sunday Schools of the Methodist Episcopal Church in New York and the Sabbath School children of the Methodist Episcopal Church in Philadelphia—the former quotes from the Bible verse Proverbs , "The memory of the just is blessed".[44]:&#;,&#;&#;

OttomanSultanAbdul Mejid I donated $30, toward the construction of the Washington monument. The Sultans' donation was the largest single donation toward the building of the Washington Monument. The Sultan's intention was to bridge peace between the Ottomans and the Americans. The stone containing the Turkish inscriptions commemorating this event is on the foot level. The translation of the inscriptions state, "To support the continuation of true friendship Abdul Mejid Khan's clear and pure name was written on the lofty stone in Washington."[44]:&#;&#; It combines the works of two eminent calligraphers: an imperial tughra by Mustafa Rakım's student Haşim Efendi, and an inscription in jalī ta'līq script by Kazasker Mustafa Izzet Efendi, the calligrapher who wrote the giant medallions at Hagia Sophia in Istanbul.[][]

One stone was donated by the Ryukyu Kingdom and brought back by Commodore Matthew C. Perry,[] but never arrived in Washington (it was replaced in ).[44]:&#;&#; Many of the stones donated for the monument carried inscriptions that did not commemorate George Washington. For example, one from the Templars of Honor and Temperance stated "We will not make, buy, sell, or use as a beverage, any spiritous or malt liquors, Wine, Cider, or any other Alcoholic Liquor."[44]:&#;&#; (George Washington himself had owned a whiskey distillery which operated at Mount Vernon after he left the presidency.[])

Aluminum apex[edit]

Aluminum apex showing inscriptions on its east (left) and north (right) faces. Lightning rods not shown.

The aluminum apex, composed of a metal that at the time was as rare and valuable as silver, was cast by William Frishmuth of Philadelphia.[10] At the time of casting, it was the largest piece of aluminum in the world. Before the installation, it was put on public display at Tiffany's in New York City and stepped over by visitors who could say they had "stepped over the top of the Washington Monument". It was inches (23&#;cm) tall before 3&#;8 inch (1&#;cm) was vaporized from its tip by lightning strikes during –, when it was protected from further damage by tall lightning rods surrounding it. Its base is inches (14&#;cm) square. The angle between opposite sides at its tip is 34°48'. It weighed ounces (&#;kg) before lightning strikes removed a small amount of aluminum from its tip and sides.[30] Spectral analysis in showed that it was composed of % aluminum with the rest impurities.[10] It has a shallow depression in its base to match a slightly raised area atop the small upper surface of the marble capstone, which aligns the sides of the apex with those of the capstone, and the downward protruding lip around that area prevents water from entering the joint.[15]:&#;83–84&#; It has a large hole in the center of its base to receive a threaded inch (&#;cm) diameter copper rod which attaches it to the monument and used to form part of the lightning protection system.[15]:&#;91&#; In the National Geodetic Survey reported the coordinates of the 1&#;mm dimple atop the aluminum apex as 38°53′″N77°2′″W / °N °W / ; (WGS 84).[1]:&#;6,&#;82,&#;86&#;

The four faces of the external aluminum apex all bear inscriptions in cursive writing (Snell Round hand), which are incised into the aluminum.[10] The apex was inscribed on site after it was delivered. Most inscriptions are the original inscriptions, except for the top three lines on the east face which were added in From to a wide gold-plated copper band that held eight short lightning rods, two per side but not at its corners, covered most of the inscriptions, which were damaged and illegible as shown in the accompanying picture made in A new band including eight long lightning rods, one at each corner and one at the middle of each side, was added in and removed and discarded in The inscriptions that it covered were still damaged and illegible in [1]:&#;90–95&#; Only the top four and bottom two lines of the north face, the first and last lines of the west face, the top four lines of the south face, and the top three lines of the east face are still legible. Even though the inscriptions are no longer covered, no attempt was made to repair them when the apex was accessible in The following table shows legible inscriptions in blue and illegible inscriptions in red.[1]:&#;93&#; No colors appear on the actual apex. The inscriptions occupy the lower portions of triangles, thus the inscribed upper lines are necessarily shorter than some lower lines.

North faceWest faceSouth faceEast face
Joint Commission
at
Setting of Cap Stone.
—————
Chester A. Arthur.
W. W. Corcoran, Chairman.
M. E. Bell.
Edward Clark.
John Newton.
Act of August 2,



Corner Stone Laid
on Bed of Foundation
July 4,
First Stone at Height of
&#;feet laid
August 7,
Capstone set December 6,
Chief Engineer
and
Architect,
Thos. Lincoln Casey,
Colonel, Corps of Engineers.
Assistants:
George W. Davis, Captain, 14th Infantry.
Bernard R. Green, Civil Engineer.
Master Mechanic,
P. H. McLaughlin.
Repaired ,
National Park Service,
Department of the Interior.


Laus Deo.



Although most printed sources, Harvey (),[28]:&#;&#; Olszewski (),[25]:&#;app C&#; Torres (),[15]:&#;82,&#;84&#; and the Historic Structure Report (),[6]:&#;–&#; refer to the original inscriptions, the National Geodetic Survey ()[1]:&#;90–95&#; refers to both the and inscriptions. All sources print them according to their own editorial rules, resulting in excessive capitalization (Harvey, Olszewski, and NGS) and inappropriate line breaks. No printed source uses cursive writing, although pictures of the apex clearly show that it was used for both the and inscriptions.[1]:&#;92–95&#;[][]

A replica displayed on the foot level uses totally different line breaks than those on the external apex—it also omits the inscriptions. In October , it was discovered that the display of this replica was positioned so that the Laus Deo (Latin for "praise be to God") inscription could not be seen and Laus Deo was omitted from the placard describing the apex. The National Park Service rectified the omission by creating a new display.[]

Lightning protection[edit]

The pyramidion, the pointed top 55 feet (17&#;m) of the monument, was originally designed with an inch (23&#;cm) tall inscribed aluminum apex which served as a single lightning rod, installed December 6, Six months later on June 5, lightning damaged the marble blocks of the pyramidion,[] so a net of gold-plated copper rods supporting 3-inch (&#;cm) gold-plated, platinum-tipped copper points spaced every 5 feet (&#;m) was installed over the entire pyramidion.[6]:&#;–,&#;3–15,&#;figs ,&#;&#;[25]:&#;chp 6&#;[15]:&#;91–92&#; The original net included a gold-plated copper band attached to the aluminum apex by four large set screws which supported eight closely spaced vertical points that did not protrude above the apex. In these eight short points were lengthened to extend them above the apex by 6 inches (15&#;cm).[] In this original system was removed and discarded. It was replaced by only two thick solid aluminum lightning rods protruding above the tip of the apex by about one foot (&#;m) attached to the east and west sides of the marble capstone just below the apex.[1]:&#;23,&#;26&#;[11]

Until it was removed, the original lightning protection system was connected to the tops of the four iron columns supporting the elevator with large copper rods. Even though the aluminum apex is still connected to the columns with large copper rods, it is no longer part of the lightning protection system because it is now disconnected from the present lightning rods which shield it. The two lightning rods present since are connected to the iron columns with two large braided aluminum cables leading down the surface of the pyramidion near its southeast and northwest corners. They enter the pyramidion at its base, where they are tied together (electrically shorted) via large braided aluminum cables encircling the pyramidion two feet (&#;m) above its base.[11] The bottom of the iron columns are connected to ground water below the monument via four large copper rods that pass through a 2-foot (&#;m) square well half filled with sand in the center of the foundation. The effectiveness of the lightning protection system has not been affected by a significant draw down of the water table since because the soil's water content remains roughly 20% both above and below the height of the water table.[]

Walls[edit]

Showing about 85 irregular large stones in mortar between empty shaft well and outer marble veneer
Cross section of rubble in shaft at feet and typical of rubble below feet

During the first phase of construction (–), the walls were built with bluestone gneiss rubble, ranging from very large irregular stones having a cross section of about 5 by 10 feet (&#;m ×&#;&#;m) down to spalls (broken pieces of stone) all embedded in a large amount of mortar. The outer surface is marble stones 14&#;to 18 inches (36–46&#;cm) thick in 2-foot (61&#;cm) high courses or rows horizontally encircling the monument. Although each course contains both stretchers (stones parallel to the wall) and headers (stones projecting into the wall), about two to three times as many stretchers as headers were used. Their joints were so thin that some stones pressed on bare stone below them, breaking off many pieces since it was constructed. The batter or slope of the outer surface is inches per foot (&#;cm/m, 1°11'). The inner surface has disorderly rows of smaller roughly dressed bluestone gneiss.[6]:&#;B&#;[7]:&#;sheets 7–30&#;[15]:&#;18–19,&#;23,&#;–6&#; The base of the first phase walls has an outer dimension of 55&#;feet 1+1&#;2&#;inches (&#;m) square and a thickness of 15 feet (&#;m). The interior well is 25&#;feet 1&#;inch (&#;m) square and has square corners.[9] The weight of the first phase walls up to feet (&#;m) is 22, long tons (25, short tons; 22, tonnes).[9]

During the second phase (–), the walls were constructed of smoothly dressed (ashlar) large marble and granite blocks (rectangular cuboids) laid down in an orderly manner (Flemish bond) with thick joints. Two-foot high marble surface stones, using an equal number of stretchers and headers, were backed by granite blocks from the foot level (the first course above the rubble) to the foot level, where marble headers become increasingly visible on the internal surface of the walls up to the foot level, above which only marble stones are used.[K] Between the and foot levels the inner walls rapidly slope outward, increasing the shaft well from 25 feet 1 inch square to 31&#;feet 5+1&#;2&#;inches (&#;m) square with a corresponding decrease in the thickness of the walls and their weight.[7]:&#;sheets 4–5&#;[15]:&#;23&#; The second phase walls at the foot level were 8&#;feet 7+1&#;2&#;inches (&#;m) thick, which, combined with the larger shaft well, yields an outer dimension of 48&#;feet 8+1&#;2&#;inches (&#;m) square at that level. The top of the second phase walls are 34&#;feet 5+1&#;2&#;inches (&#;m) square and 1&#;foot 6&#;inches (46&#;cm) thick.[6]:&#;3–7&#;[9] The second phase interior walls have rounded corners (2-foot (&#;m) radii). The weight of the second phase walls (from feet to feet) are 21, long tons (23, short tons; 21, tonnes). The walls of the entire shaft (combined first and second phases) are &#;feet 5+1&#;8&#;inches (&#;m) high.[9]

The first phase of the walls was constructed under the direction of William Dougherty. Its white Cockeysville marble exterior came from the Texas quarry now adjacent to and east of north I near the Warren Road exit in Cockeysville, Maryland. The quarry was named for the Texas Station (no longer extant) and 19th-century town on the Northern Central Railway. During the first phase it was operated by Thomas Symington, but is now operated by Martin Marietta Materials[] and no longer produces building stone. The second phase of construction was under the direction of Lt Col/Col Thomas Lincoln Casey of the United States Army Corps of Engineers, who removed two defective courses added by the Know-Nothings and the last foot course added by Dougherty before Casey began his construction. The next three courses of white marble (– feet (46–48&#;m)) came from Sheffield, Massachusetts, while all courses above them came from the Beaver Dam quarry just west of the 19th-century town of Cockeysville.[15]:&#;63&#;[][] The latter quarry is located on Beaver Dam Road near its intersection with McCormick Road. During the second phase the quarry was operated by Hugh Sisson, but is now flooded, is called Beaverdam Pond, and is the home of the Beaver Dam Swimming Club. Both 19th-century towns are now within the city limits of Cockeysville.

Pyramidion[edit]

Rib structure of pyramidion with letter designations for courses

The marble capstone of the pyramidion is a truncated pyramid with a cubical keystone projecting from its base and a deep groove surrounding the keystone. The aluminum apex replaces its truncated top. The inside upper edges of the topmost slabs on the four faces of the pyramidion rest on the keystone and in the groove. It has a large vertical hole through which a inch (&#;cm) threaded copper rod passes and screws into the base of the apex, which used to form part of its lightning protection system. The keystone and groove occupy so much of its base that only a small horizontal area near its outer edge remains. The weight of the capstone is transferred to both the inner and outer portions of the shiplap upper edges of the slabs. It weighs 3, pounds (1,&#;kg), is 5&#;feet 2&#;inches (&#;m) high from its base to its top, and is 3 feet (91&#;cm) square at its base.[15]:&#;85&#;[]:&#;80&#;

The marble pyramidion has an extremely complex construction to save weight yet remain strong. Its surface slabs or panels are usually only 7 inches (18&#;cm) thick (with small thick and thin portions) and generally do not support the weight of slabs above them, instead transferring their own weight via 1-foot (30&#;cm) wide internal marble ribs to the shaft's walls. The slabs are generally 7 feet (2&#;m) wide and 4&#;feet 4&#;inches (1&#;m) high with a 2-inch (5&#;cm) vertical overlap (shiplap) to prevent water from entering the horizontal joints. Twelve such courses, the internal ribs, the marble capstone, and the aluminum apex comprise the pyramidion. Its height is 55&#;feet 0&#;inches (&#;m). Its weight is long tons ( short tons; tonnes).[9] The slope of the walls of the pyramidion is 17°24' from the vertical.[30] There are twelve ribs, three per wall, which spring from the foot (&#;m) level, all being integrated into the walls up to the foot (&#;m) level. All are free standing above feet, relying on mortise and tenon joints to attach neighboring stones. The eight corner ribs terminate six courses above the shaft, each corner rib resting on its neighboring corner rib via a miter joint, forming four corner arches. Each such arch supports a pair of square corner stones, one above the other totaling one course in height. Each corner rib is linked to the nearest center rib at the sixth course via a marble tie beam. The four center ribs terminate eight courses above the shaft at a marble cruciform (cross shaped) keystone, forming two main arches that cross each other. Two stones, each one course high, are mounted on each of the four ribs, supporting two additional courses above the cruciform keystone, leaving two courses to support the capstone's weight by themselves.[6]:&#;–&#;[18]:&#;6–10&#;[]

The observation floor (nominally the foot level) is &#;feet 4+1&#;2&#;inches (&#;m) above the entry lobby floor or lowest landing level. It is 1+1&#;4 inches (&#;cm) above the marble base of the pyramidion and the top of the shaft walls.[1]:&#;56,&#;58,&#;65&#;[7]:&#;sheet 7,&#;31–35&#;[9]

Four pairs of 3-foot (91&#;cm) wide observation windows are provided, spaced 4 feet (&#;cm) apart, inner stone edge to edge, all just above the lowest course of slabs (foot level). Six are 1&#;foot 6&#;inches (46&#;cm) high while two on the east face are 2 feet (61&#;cm) high for easier egress. All were originally provided with thin marble shutters in a bronze frame each of which could be opened inward, one left and the other right per wall.[6]:&#;3–11&#; After two people committed suicide by jumping through the open windows in the s, hinged horizontal iron bars were added to them in [6]:&#;3–14&#;[15]:&#;85,&#;&#; A ninth opening in a slab on the south face just below the capstone is provided for access to the outside of the pyramidion. It is covered by a stone slab which is internally removable. In , four red aircraft warning lights were installed, one per face in one of its observation windows. Pilots complained that they could not be easily seen, so the monument was floodlit on all sides as well.[6]:&#;2–14,&#;B,&#;B,&#;B–B&#; In , eight inch (36&#;cm) diameter holes for new red aircraft warning lights were bored, one above each window near the top edge of the fourth course of slabs (foot level) in the pyramidion.[6]:&#;2–28,&#;3–15,&#;B&#;[7]:&#;sheet 12&#; In the observation windows were glazed with shatterproof glass. In –, they were glazed with bulletproof glass and the shutters removed. New bulletproof glass was installed during –[6]:&#;3–16,&#;3–18,&#;B&#;

The pyramidion has two inscriptions, neither of which is regarded as a memorial stone. One is the year "" on the underside of the cruciform keystone; the other is at the same level as that keystone on the north face of the west center rib containing the names and titles of the four highest ranked builders. Its inscription ("Chief Engineer ") is almost identical to the inscription on the south face of the aluminum apex except for "U.S.", which is part of the phrase "14th U.S. Infantry" in the inscription inside the pyramidion, but the apex has only "14th Infantry". Additionally, the internal inscription does not use cursive writing and all letters in all names are capitals.[7]:&#;sheet 35&#;[18]:&#;8&#;

Foundation[edit]

Cross section of foundation, both old and reinforced, showing dimensions

The first phase began with the excavation of about 7&#;feet 8&#;inches (&#;m) of topsoil down to a level of loam, consisting of equal parts of sand and clay, hard enough to require picks to break it up. On this "bed of the foundation" the cornerstone was laid at the northeast corner of the proposed foundation. The rest of the foundation was then constructed of bluestone gneiss rubble and spalls, with every crevice filled with lime mortar.[15]:&#;23,&#;68&#; The dimensions of this old foundation were 23&#;feet 4&#;inches (&#;m) high, 80 feet (&#;m) square at the base, and 58&#;feet 6&#;inches (&#;m) square at the top, laid down in eight steps, similar to a truncated step pyramid.[15]:&#;18–19,&#;23,&#;47&#; At the center of the foundation a brick-lined 2-foot (60&#;cm) square well was dug to a depth of 20 feet (6&#;m) below the bed of the foundation to keep it dry and to supply water during construction.[15]:&#;19&#;

During the second phase, after determining that the proposed weight of the monument was too great for the old foundation to safely bear, the thickness of the walls atop the unfinished stump was reduced and the foundation was strengthened by adding a large unreinforced concrete slab below the perimeter of the old foundation to increase the monument's load bearing area two and one half times. The slab was 13&#;feet 6&#;inches (&#;m) thick, with an outer perimeter &#;feet 5+1&#;2&#;inches (&#;m) square, an inner perimeter 44 feet (&#;m) square, with undisturbed loam inside the inner perimeter except for the water well. The area at the base of the second phase foundation is 15, square feet (1,&#;m2). The strengthened foundation (old foundation and concrete slab) has a total depth of 36&#;feet 10&#;inches (&#;m) below the bottom of the lowest course of marble blocks (now below ground), and 38 feet (&#;m) below the entry lobby floor. Casey reported that nowhere did the load exceed 9 long tons per square foot (&#;psi; &#;kPa) and did not exceed 3 long tons per square foot (47&#;psi; &#;kPa) near the outer perimeter.[9] To properly distribute the load from the shaft to slab, about half by volume of the outer periphery of the old rubble foundation below its top step was removed. A continuous sloping unreinforced concrete buttress encircles what remains. The buttress is &#;feet 4&#;inches (&#;m) square at its base, 64&#;feet 6&#;inches (&#;m) square at its top, and 20&#;feet 5&#;inches (&#;m) high. The perimeter of the original top step of the old rubble foundation rests on the larger top of the concrete buttress. Its slope (lower external angle from the vertical) is 49°. This buttress rests in a depression (triangular cross-section) on the top surface of the concrete slab. The slab was constructed by digging pairs of 4-foot (&#;m) wide drifts on opposite sides of the monument's center line to keep the monument properly balanced. The drifts were filled with unreinforced concrete with depressions or dowel stones on their sides to interlock the sections.[6]:&#;–,&#;figs –,&#;,&#;,&#;&#;[15]:&#;39,&#;47–48,&#;67–73&#; An earthen terrace 60 feet (18&#;m) wide with its top at the base of the walls and steep sides was constructed in –81 over the reinforced foundation while the rest of the monument was being constructed. During –88, a knoll was constructed around the terrace tapering out roughly feet (90&#;m) onto the surrounding terrain. This earthen terrace and knoll serves as an additional buttress for the foundation. The weight of the foundation is 36, long tons (41, short tons; 37, tonnes),[9] including earth and gneiss rubble above the concrete foundation that is within its outer perimeter.

Stairs and elevator[edit]

North interior wall with its stairs and their wire screening.

The monument is filled with ironwork, consisting of its stairs, elevator columns and associated tie beams, none of which supports the weight of the stonework. It was redesigned in to reduce congestion and improve the flow of visitors. Originally, visitors entered and exited the west side of the elevator on the observation floor, causing congestion. So the large landing at the foot level was expanded to a full floor and the original spiral stair in the northeast corner between the and foot levels was replaced by two spiral stairs in the northeast and southeast corners. Now visitors exit the elevator on the observation floor, then walk down either spiral stair before reboarding the elevator for their trip back down.[6]:&#;fig &#;

The main stairs spiral up the interior walls from the entry lobby floor to the elevator reboarding floor at the foot level. The elevator occupies the center of the shaft well from the entry lobby to the observation floor, with an elevator machine room (installed –26) whose floor is 18&#;feet 10&#;inches (&#;m) above the observation floor and an elevator pit (excavated ) whose floor is 9 feet (&#;m) below the entry lobby floor.[7]:&#;sheet 31–35&#;[15]:&#;61,&#;74&#; The stairs and elevator are supported by four wrought iron columns each. The four supporting the stairs extend from the entry lobby floor to the observation floor and were set at the corners of a footinch (&#;m) square. The four supporting the elevator extend from the floor of the elevator pit to 14 feet (&#;m) above the observation floor and were set at the corners of a 9-foot-9+1&#;2-inch (&#;m) square.[6]:&#;3–6&#; The weight of the ironwork is long tons ( short tons; tonnes).[9]Cast iron, wrought iron, and steel were all used. The two small spiral stairs installed in are aluminum.

Most landings occupy the entire east and west interior walls every 10 feet from and including the east landing at the foot level up to the west landing at the foot level, east then west alternately. Three stairs with small landings rise from the entry lobby floor to the foot level successively along the north, west and south interior walls. Landings from the foot level up to the foot level are 3&#;feet 2+1&#;4&#;inches (&#;m) by 25&#;feet 1&#;inch (&#;m), while landings from the foot level to the foot level are 7&#;feet 10+3&#;4&#;inches (&#;m) by 31&#;feet 5+1&#;2&#;inches (&#;m). All stairs are on the north and south walls except for the aforementioned west stair between the and foot levels, and the two spiral stairs.

About one fourth of visitors chose to ascend the monument using the stairs when they were available. They were closed to up traffic in , and then closed to all traffic except by special arrangement in [6]:&#;3–18&#;[15]:&#;&#; The stairs had steps until , consisting of 18 risers in each of the 49 main stairs plus 16 risers in the spiral stair.[25]:&#;chp 7&#;[]:&#;18&#; Since the stairs have had risers if only one spiral stair is counted because both spiral stairs now have 15 risers each.[7]:&#;sheets 6,&#;31–35&#;[15]:&#;72&#; These figures do not include two additional steps in the entry passage that were covered up in by a ramp and its inward horizontal extension to meet the higher (since ) entry lobby floor. One step was feet (1&#;m) away from the outer walls and the other was at the end of the passage, 15 feet (&#;m) away from the outer walls.[6]:&#;–,&#;figs ,&#;–,&#;&#;

As initially constructed, the interior was relatively open with two-rail handrails, but a couple of suicides and an accidental fall prompted the addition of tall wire screening (7 feet (&#;m) high with a large diamond mesh) on the inside edge of the stairs and landings in The original steam powered elevator, which took 10 to 12 minutes to ascend to the observation floor, was replaced by an electric elevator powered by an on-site dynamo in which took five minutes to ascend. The monument was connected to the electrical grid in , allowing the installation of a modern electric elevator in –26 which took 70 seconds. The latter was replaced in and again in by second elevators.[6]:&#;2–13,&#;2–15,&#;–,&#;B,&#;B,&#;B&#;[28]:&#;,&#;–8&#; From to , the wire screening at three platforms was replaced by large glass panels to allow visitors on the elevator to view three clusters of memorial stones that were synchronously lit as the elevator automatically slowed while passing them during its descent.[6]:&#;3–21,&#;4–16&#;

Flags[edit]

Fifty American flags around the monument

Fifty American flags (not state flags), one for each state, are now flown 24 hours a day around a large circle centered on the monument. Forty eight American flags (one for each state then in existence) were flown on wooden flag poles on Washington's birthday since and later on Independence Day, Memorial Day, and other special occasions until early Both the flags and flag poles were removed and stored between these days. In fifty foot (&#;m) tall aluminum flag poles (anticipating Alaska and Hawaii) were installed, evenly spaced around a foot (79&#;m) diameter circle. During –05, the diameter of the circle was reduced to feet (73&#;m). Since Washington's birthday , 48 American flags were flown on a daily basis, increasing to 49 flags on July 4, , and then to 50 flags since July 4, When 48 and 49 flags were flown, only 48 and 49 flag poles of the available 50 were placed into base receptacles. All flags were removed and stored overnight. Since July 4, , 50 American flags have flown 24 hours a day.[6]:&#;–,&#;–,&#;B–B&#;[7]:&#;sheet 3&#;[16]

Vesica piscis[edit]

In the grounds renovation, two large circles were added to the landscaping with the obelisk in the intersection or vesica piscis. The monument's vesica piscis is not ideal because neither circle passes through the center of its neighbor. Furthermore, both "circles" are slightly elliptical.

Miscellaneous details[edit]

The total cost of the monument from to was $1,,[] (equivalent to $30,, in ).[] The weight of the above ground portion of the monument is 44, long tons (49, short tons; 44, tonnes), whereas its total weight, including the foundation below ground and any earth above it that is within its outer perimeter is 81, long tons (90, short tons; 82, tonnes). The total number of blocks in the monument, including all marble, granite and gneiss blocks, whether externally or internally visible or hidden from view within the walls or old foundation is over 36,[8] The number of marble blocks externally visible is about 10,

The monument stands &#;feet 7+11&#;32&#;inches (&#;m) tall according to the National Geodetic Survey (measured –14) or &#;feet 5+1&#;8&#;inches (&#;m) tall according to the National Park Service (measured ).[B] In , a ramp covered two steps at the entrance to the monument, so the ground next to the ramp was raised to match its height, reducing the remaining height to the monument's apex. It is both the world's tallest predominantly stone structure and the world's tallest obelisk. It is the tallest monumental column in the world if all are measured above their pedestrian entrances, but two are taller when measured above ground, though they are neither all stone nor true obelisks.[A] The tallest masonry structure in the world is the brick Anaconda Smelter Stack in Montana at &#;feet 1+1&#;2&#;inches (&#;m) tall. But this includes a foot (&#;m) non-masonry concrete foundation, leaving the stack's brick chimney at &#;feet 1+1&#;2&#;inches (&#;m) tall, only about 6 inches (15&#;cm) taller than the monument's height. If the monument's aluminum apex is also discounted, then the stack's masonry portion is 15 inches (38&#;cm) taller than the monument's masonry portion.[12][B][L]

Security[edit]

A low-profile ha-hawall surrounds the monument.

In , a temporary visitor security screening center was added to the east entrance of the Washington Monument in the wake of the September 11 attacks. The one-story facility was designed to reduce the ability of a terrorist attack on the interior of the monument, or an attempt to seize and hold it. Visitors obtained their timed-entry tickets from the Monument Lodge east of the memorial, and passed through metal detectors and bomb-sniffing sensors prior to entering the monument. After exiting the monument, they passed through a turnstile to prevent them from re-entering. This facility, a one-story cube of wood around a metal frame, was intended to be temporary until a new screening facility could be designed.[17]

On March 6, , the National Capital Planning Commission approved a new visitor screening facility to replace the temporary one. The square-foot (&#;m2) facility will be two stories high and contain space for screening 20 to 25 visitors at a time. The exterior walls (which will be slightly frosted to prevent viewing of the security screening process) will consist of an outer sheet of bulletproof glass or polycarbonate, a metal mesh insert, and another sheet of bulletproof glass. The inner sheet will consist of two sheets (slightly separated) of laminated glass. A inch (&#;cm) airspace will exist between the inner and outer glass walls to help insulate the facility. Two (possibly three) geothermal heat pumps will be built on the north side of the monument to provide heating and cooling of the facility. The new facility will also provide an office for National Park Service and United States Park Police staff. The structure is designed so that it may be removed without damaging the monument.[] The United States Commission of Fine Arts approved the aesthetic design of the screening facility in June []

A recessed trench wall known as a ha-ha has been built to minimize the visual impact of a security barrier surrounding the monument. After the September 11 attacks and another unrelated terror threat at the monument, authorities had put up a circle of temporary Jersey barriers to prevent large motor vehicles from approaching. The unsightly barrier was replaced by a less-obtrusive low inch (76&#;cm) granite stone wall that doubles as a seating bench and also incorporates lighting. The installation received the Park/Landscape Award of Merit from the American Society of Landscape Architects.[][][]

Transit[edit]

The Washington Monument is served by the Smithsonian metro station.[]

See also[edit]

Notes[edit]

  1. ^ abcTwo other monumental columns (honoring a person or thing) have heights comparable to that of the Washington Monument, the San Jacinto Monument in Texas and the Juche Tower in North Korea. Which of the three is taller depends on how its height is measured.[12] A traditional method is above a part of the monument comparable to ground level. A more recent method is that used by the Council on Tall Buildings and Urban Habitat (CTBUH), the arbiter of the height of tall buildings since The CTBUH states the height of a building must be measured above the "level of the lowest, significant, open-air, pedestrian entrance".[4] The three CTBUH (above pedestrian entrance) heights from tallest to shortest are the Washington Monument, the San Jacinto Monument (− feet (−&#;m)), and the Juche Tower (−20 feet (−6&#;m)). The above ground heights of the three monumental columns from tallest to shortest are the San Jacinto Monument (+ feet (&#;m)), the Juche Tower ( feet (+1&#;m)), and the Washington Monument. Height differences are relative to the height of the Washington Monument.
    • The Washington Monument's CTBUH (above pedestrian entrance) height, &#;feet 7+11&#;32&#;inches (&#;m), is the same as its above ground height.
    • The San Jacinto Monument has a surveyed height of feet (&#;m) from its footing to the top of its beacon. However, the architect of the monument, Albert C. Finn, stated, "San Jacinto is actually feet [&#;m] from the first floor to the top of the beacon" in the "customary way" of measuring such things.[13] The "first floor" is the CTBUH criterion. A stepped terrace elevates this pedestrian entrance above ground, thus reducing the monument's remaining height by its thickness, about feet (&#;m), to the monument's CTBUH height. The monument is made of reinforced concrete, not stone, although it has a facade of limestone.
    • The Juche Tower has a specified height of feet (&#;m) above a very large concrete bus parking lot just east of the tower. A stepped terrace elevates its pedestrian entrance, also on its east side, above this ground level. Its thickness, 23 feet (7&#;m), reduces the remaining height of the tower to feet (&#;m), its CTBUH height. The tower is made of reinforced concrete, not stone, although it has a facade of granite. A metal cage holding many panels of red glass in the shape of a flame, internally illuminated, surmounting a gold-colored "fuel chamber", occupies its top 66 feet (20&#;m).
  2. ^ abcSeveral heights have been specified, all of which exclude the foundation whose top is 15&#;feet 8&#;inches (&#;m) above the pre-construction ground level. The foundation is surrounded by a grassy knoll which effectively places the foundation below ground level. This knoll serves as a buttress for the foundation.
    • &#;feet 7+11&#;32&#;inches (&#;m) according to the National Geodetic Survey (NGS)[1]:&#;5&#; using the criteria of the Council on Tall Buildings and Urban Habitat (CTBUH), that is, from the "level of the lowest, significant, open-air, pedestrian entrance" to the highest point of the building.[4] From among four candidate points suggested by the NGS, the CTBUH chose a point on the entry ramp installed in where it crosses the outer face of the marble facade of the monument.[3]:&#;7&#;[5][6]:&#;2–15,&#;3–18,&#;4–13,&#;B,&#;figs ,&#;,&#;,&#;&#;[7]:&#;sheet 31&#; Measured –14 and reported February 16, This is also its new above ground height because the ground at the shaft was raised in to match the ramp. The ground surrounding the shaft was replaced by granite pavers during –05 to match the raised ground level and the ramp. This height is centimeters (8+5&#;8&#;in) above four "CASEY marks", 2+1&#;2-inch-diameter (&#;cm) brass bolt heads whose shafts are inserted vertically into the topmost level of the foundation just outside the four corners of the monument. These CASEY marks were set flush with the lower surface of the marble blocks. The NGS thinks they were likely used by Col. Thomas Lincoln Casey, the engineer in charge of construction, to determine the traditional height in The floor at the elevator is now centimeters (5+1&#;2&#;in) above this pedestrian entrance, and centimeters (14+1&#;8&#;in) above the CASEY marks.[1]:&#;13,&#;56,&#;65,&#;82–84&#; The highest point of the monument is a one millimeter diameter dimple atop the aluminum apex.
    • &#;feet 5+1&#;8&#;inches (&#;m) according to the National Park Service.[8] Measured and reported in by Col. Thomas Lincoln Casey, the engineer in charge of construction.[9] It was measured from the top of the foundation (the lowest marble joint or the door-sills of the two empty doorways), which was in place in This is the traditional height of the monument that became moot when the pavement or ground next to the monument was raised in
    • &#;feet 11+1&#;2&#;inches (&#;m) according to architectural drawings in the Historic American Buildings Survey (), pavement at shaft to tip.[7]:&#;sheets 7,&#;31&#; This height is comparable to the NGS height because it was also determined after the ramp was installed in
    None of these heights include a set of lightning rods surrounding the monument's aluminum apex. An old set was installed in , which protruded above its tip by 6 inches (15&#;cm).[10] In a new set of lightning rods was installed which protrude above the apex by about one foot (&#;m).[1]:&#;23,&#;26&#;[11]
  3. ^The base of the obelisk atop the circular pillar was to have been "70 feet square" according to the House report of [27]:&#;8&#; and Torres (),[15]:&#;13&#; but only "50 feet square" according to Harvey ().[28]:&#;27&#; The corners of a foot square base (foot diagonal) would dangerously overhang a foot diameter pillar, whereas a foot square base (foot diagonal) would not.
  4. ^L'Enfant identified himself as "Peter Charles L'Enfant" during most of his life, while residing in the United States. He wrote this name on his "Plan of the city intended for the permanent seat of the government of t(he) United States&#;" and on other legal documents.[31] However, during the early s, the then French ambassador to the U.S., Jean Jules Jusserand, popularized the use of L'Enfant's birth name, "Pierre Charles L'Enfant".[32] The National Park Service identifies L'Enfant as "Major Peter Charles L'Enfant" and as "Major Pierre (Peter) Charles L'Enfant" on pages of its website that describe the Washington Monument.[33][34] The United States Code states in 40&#;U.S.C.
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