Washington is a hilly city, and Capitol Hill is a high ground on which the Capitol is located. From a distance, the Capitol is a giant column-ringed building, with a crown-shaped dome in the middle, a large white-domed government building made of white sand and marble, 751 feet long, 350 feet wide, and 135 feet from the top. A bronze "freedom statue" of19.5 feet high is erected on the center, the most striking symbol of Washington. The south side of the Capitol is the lower house and the north side is the upper house. The ceiling and walls of the Capitol are covered with murals on the theme of the history of the founding. Visitors are free to visit, or take guided tours. The tour takes about 35 minutes.