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

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Russell Senate Office Building
The Russell Senate Office Building (built 1903-1908) is the oldest of the...

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Guided Tours: Buildings on Capitol Hill
Official Tours of the U.S. Capitol Building are offered Monday through...

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The AOC maintains the grounds of the U.S. Capitol
The roles and responsibilities of the Architect of the Capitol cover an...

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AOC Elevator Mechanics at the Library of Congress
“We deal with a lot of history.” No, those aren’t the words of the AOC’s...

Materials

  • A row of marble statues in National Statuary Hall in the U.S. Capitol.
    Marble is used throughout the U.S. Capitol Building, the congressional office...
     
  • Nighttime view of the cast iron used in the making of the Capitol's dome.
    Cast iron was used extensively in the U.S. Capitol’s mid-19th century House...
     
  • Sandstone walls and paintings of the U.S. Capitol Rotunda
    Sandstone was a common building material during the early years of Washington...
     

The materials used in the construction of the Capitol were chosen with care to ensure the building would be a lasting landmark. Learn more about these building materials, why they were used, and where they came from.

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