Fort Norfolk at Norfolk, Virginia, authorized in 1794 by President George Washington, is the last remaining fortification of his 18th-century harbor defense system. Built between 1795 and 1809, the four-acre site overlooking the Elizabeth River includes earthwork embankments, ramparts, a dungeon, officers' quarters, powder magazine, barracks, and guardhouse. The fort defended Norfolk during the War of 1812 and the Civil War; its powder magazine supplied the CSS Virginia during its famous encounter with the USS Monitor. Designated a national historic district and listed on the National Register in 1976, it offers free self-guided tours.