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U.S. Capitol Dome was constructed with 8,909,200 pounds of ironwork bolted together in a masterpiece of American will and ingenuity.
The U.S. Capitol’s dome made of cast iron was designed by Thomas U. Walter and...

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

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Photo of a Roots and Reflections tour at the U.S. Botanic Garden.
The U.S. Botanic Garden is committed to welcoming every visitor by providing...

Explore Capitol Hill

  • Featured

    Saving Life & Limb: AOC Arborists

    Their official job titles are Tree Surgeon and they work to keep their patients alive for hundreds of years.

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    Grant Memorial Restoration

    Starting spring 2015, the AOC will begin conservation efforts to restore the bronze monuments of the Grant Memorial located in Union Square.

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    Meet the Carillonneur of the Capitol

    Jim Saenger, the Capitol’s Carillonneur, has perhaps one of the most unique and least visible jobs on the Hill.

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    Olmsted Terrace Preservation

    The AOC has started a five-phased project that will repair the masonry at the terrace walls.

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Capitol Grounds