Fort Monroe (also known as Fortress Monroe) was a military installation in Hampton, Virginia—at Old Point Comfort, the southern tip of the Virginia Peninsula. Along with Fort Wool, Fort Monroe guarded the navigational channel between the Chesapeake Bay and Hampton Roads—the natural roadstead at the confluence of the Elizabeth, the Nansemond and the James rivers. Completely surrounded by a moat, the six-sided stone fort was the last remaining fort in the United States still active as an Army post when it was decommissioned in 2011. - Source: Wikipedia