The Main Gate serves as the entrance to the Marine Corps Historic District. The U.S. Marine Corps Barracks and Commandant's House comprise the Nation's oldest continually active Marine Corps installation. Situated in southeast Washington, the post occupies a rectangular site about 250 feet wide and 630 feet long. It is bounded by G Street on the north, I Street on the south, 8th Street on the west, and 9th Street on the east. The post includes the Marine Corps Commandant's House, a range of barracks, a band hall, a row of five officer's quarters, and a modern service building that abuts the north end of the barracks. These structures form a quadrangle that encloses a rectangular parade ground measuring approximately 160 feet by 385 feet. Except for the Commandant's House, which faces north, all the buildings face the parade ground.