Stewards of the iconic buildings and grounds of Capitol Hill since 1793.

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Outside view of the Longworth House Office Building with a clear blue sky in the background.
Completed in the spring of 1933, the Longworth House Office Building is the...

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Snapshot of a crowd of people on a guided tour through the Rotunda of the U.S. Capitol
Official Tours of the U.S. Capitol Building are offered Monday through...

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East Front of the U.S. Capitol Building
AOC’s annual Performance and Accountability Report provides the results of the...

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East Front Plaza Repairs
AOC is making repairs to expansion joints on the East Front Plaza of the...

U.S. Capitol Building

The United States Capitol Building is located in Washington, D.C., at the eastern end of the National Mall on a plateau 88 feet above the level of the Potomac River. Learn about the history, art and architecture of the U.S. Capitol Building here, and take an interactive look at the building through the Architect's Virtual Capitol.

For information on touring the U.S. Capitol building visit: www.visitthecapitol.gov.

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