United States Capitol Rotunda - Design and Construction

Design and Construction

The doctor and architect William Thornton was the winner of the contest to design the Capitol in 1793. Thornton had first conceived the idea of a central rotunda. However, due to lack of funds or resources, oft-interrupted construction, and the British attack on Washington during the War of 1812, work on the rotunda did not begin until 1818. The rotunda was completed in 1824 under Architect of the Capitol Charles Bulfinch, as part of a series of new buildings and projects in preparation for the final visit of Marquis de Lafayette in 1824. The rotunda was designed in the neoclassical style and was intended to evoke the design of the Pantheon.

The sandstone rotunda walls rise 48 feet (15 m) above the floor; everything above this—the Capitol dome–was designed in 1854 by Thomas U. Walter, the fourth Architect of the Capitol. Walter had also designed the Capitol's north and south extensions. Work on the dome began in 1856, and in 1859, Walter redesigned the rotunda to consist of an inner and outer dome, with a canopy suspended between them that would be visible through an oculus at the top of the inner dome. In 1862, Walter asked painter Constantino Brumidi to design "a picture 65 feet (20 m) in diameter, painted in fresco, on the concave canopy over the eye of the New Dome of the U.S. Capitol." At this time, Brumidi may have added a watercolor canopy design over Walter's tentative 1859 sketch. The dome was being finished in the middle of the American Civil War and was constructed from fireproof cast iron. During the Civil War, the rotunda was used as a military hospital for Union soldiers. The dome was finally completed in 1866.