The United States Capitol Building, located on Capitol Hill in Washington, D.C., is the seat of the U.S. Congress and the legislative branch of the federal government. Construction began on September 18, 1793, with President George Washington laying the cornerstone. The building has undergone several major periods of construction, including rebuilding after being burned during the War of 1812 and expansions in the 1850s and 1860s.The Capitol is designed in the neoclassical style, featuring a prominent dome completed in 1866. It houses the chambers of the House of Representatives and the Senate, as well as various important offices and historical artifacts. The building is not only a functional legislative space but also a symbol of American democracy and history.