Copied dozens of times in smaller state capitols across the country; the U.S. Capitol is the real thing. Inside this 19th century neoclassical complex the Senate and the House of Representatives create the laws that govern the nation. Like many other buildings in Washington, DC and in capitals around the world the U.S. Capitol is based on ancient Greek and Roman designs, as much of our culture, law, and language is. The south wing of the building contains the chambers of the House of Representatives. The north wing is home to the Senate. They meet at the Rotunda, under a grand dome, famed for its odd acoustics and less so for its 108 windows. The dome is 180 feet three inches tall and 96 feet wide