The architect responsible for the design of the U.S. Capitol building was William Thornton. He won a design competition in 1792, leading to the construction of this iconic structure, which serves as the home of the United States Congress. Thornton's neoclassical design featured a central rotunda topped by a grand dome, symbolizing democracy. Over the years, the Capitol has undergone numerous expansions and renovations, but Thornton's vision laid the groundwork for what has become a symbol of American legislative power and American democracy. The Capitol is not only an architectural landmark but also a vital center of U.S. governance.