United States Capitol

The first Capitol was originally designed by Dr. William Thornton. The still unfinished building was set on fire by the British in 1814. It took until 1826 before the Capitol building was finished by the Bostonian architect Charles Bulfinch.
The Capitol building was later extended and in 1856 the original dome by Bulfinch was replaced by a larger, cast-iron one designed by Thomas U. Walter.The building is 751 ft long and 350 ft wide and contains 540 rooms.