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

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Thomas Jefferson Building
The Library of Congress began in 1800 with a small appropriation to buy...

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Visitor Hours for the Buildings on Capitol Hill
Visitor Hours for the Buildings on Capitol Hill.

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Dr. William Thornton
 The Architect of the Capitol (AOC) is the builder and steward of America’s...

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The Statue of Freedom atop the U.S. Capitol
This is the first in a series of occasional articles, written by the Architect...

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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