The US Capitol Building is the meeting place of the United States Congress. The House of Representatives meets in one wing and the Senate in the other wing. The dome and rotunda are in the middle between the two winds. The Capitol is located at the eastern end of the National Mall in Washington, D.C.
The building's design was selected by President George Washing in 1793. It neoclassical design recalling the buildings of the ancient Greeks and Romans. The Rotunda, for example, was intended to recall the Pantheon, the ancient Roman temple.
It is a large building, with a floor area of 16-1/2 acres. It is 751 feet long, 350 feet wide, and 288 feet tall. The building contains approximately 540 rooms and has 658 windows and approximately 850 doorways. The original building was made of brick clad in sandstone. Later additions were clad in marble. The dome is made of about 9,000 pounds of cast iron.