Serving Congress and the Supreme Court, preserving America's Capitol, and inspiring memorable experiences

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Old Senate Chamber
Located north of the Capitol Rotunda is the richly decorated Old Senate...

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The Summerhouse on the Capitol Grounds
A few ideas to help you in planning a visit to Capitol Hill.

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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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The AOC is responsible for nearly 600,000 square feet of windows
Architect of the Capitol Stephen T. Ayers reflects on the almost 600,000 square...

Materials

  • Marble
    Marble is used throughout the U.S. Capitol Building, the congressional office...
     
  • Cast Iron
    Cast iron was used extensively in the U.S. Capitol’s mid-19th century House...
     
  • Sandstone
    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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