#50. United States Capitol
Location: Washington, DC
Architect: Bulfinch, Latrobe, Thornton
Neoclassical in form, the United States Capitol achieves in articulating through architecture the principals of America's founding fathers. Think that's a load of mumbo jumbo? Then consider this: at time of completion the Capitol boasted the largest cast iron dome ever constructed, designed by an often forgotten fourth architect on the project, Mr. Thomas U. Walter.