Wednesday, April 3, 2019

Due to a special event taking place in the U.S. Capitol on Wednesday, April 3, 2019, areas regularly included in the tour of the Capitol, such as the Rotunda and National Statuary Hall, will not be available for tours until the conclusion of the event at approximately 12:30 p.m. The Capitol Visitor Center will remain open throughout the day, and guide-led opportunities in the Capitol Visitor Center will be available during the event.

The Capitol Dome

Domes soar to great heights and span vast spaces–their inspiring form is reserved for society’s greatest buildings.

The Capitol’s iron dome, an instantly recognizable American symbol, has long been admired for its majestic beauty and its ingenious engineering.

Designed by Thomas U. Walter, the dome was influenced by classical European domes, such as St. Paul’s in London, St. Isaac’s in St. Petersburg, and the Panthéon in Paris. Capt. Montgomery C. Meigs of the U.S. Army Corps of Engineers supervised much of its construction. It was especially challenging to build because it replaced an existing wooden dome (completed by Charles Bulfinch in 1824), but re-used the old rotunda walls as foundations.

Technical difficulties were easy to overcome compared to those of the Civil War, which broke out just six years after the new dome was begun. When the contractors continued installing ironwork despite wartime conditions, President Abraham Lincoln viewed the rising dome as a sign that the Union would continue as well.