Hours: Capitol Sites tour departs from the National Mall at 955 L’Enfant Plaza S.W. daily at 10, early Mar. to mid-Dec. (also at 6 p.m., Memorial Day-Labor Day). Monuments tour departs daily at 2:30, early Mar. to mid-Dec. (also at 6:30 p.m., Apr.-Oct., and additional tours are added June-Aug.). Closed July 4 and Thanksgiving.