Fort McHenry National Monument & Historic Shrine, Baltimore, Maryland, US -- during the Battle of Baltimore, September the valiant defense of the fort inspired Francis Scott Key to write "The Star-Spangled Banner.
Fort Ticonderoga, Ticonderoga, NY - built by the Canadians and French, it was strategically placed in conflicts over trade routes and played an important role during the French and Indian War and again during the American Revolutionary War.
Fort Ticonderoga, NY is a great place to visit. During the Revolutionary War, this fort belonged to the British. By the end of the war, thanks to Benedict Arnold and Ethan Allan, this fort belonged to the USA.