Bent's Old Fort is a fort located in Otero County in southeastern Colorado, United States.

a state park of Nevada.

Old Fort Erie, also known as Fort Erie, or the Fort Erie National Historic Site of Canada, was the first British fort to be constructed as part of a network developed after the Seven Years' War (known as "the French and Indian War" in the colonies) was concluded by the Treaty of Paris, at which time France ceded its territories east of the Mississippi River (all of New France) to Great Britain.

The Old Fort of Nassau, also known as Fort Nassau, was a fort in Nassau, Bahamas, first built in 1697.