Fort McHenry, in Baltimore, Maryland, is a star-shaped fort best known for its role in the War of 1812, when it successfully defended Baltimore Harbor from an attack by the British navy in Chesapeake Bay. It was during the bombardment of the fort that Francis Scott Key was inspired to write "The Star-Spangled Banner," the poem that would eventually be set to the tune of "To Anacreon in Heaven" and become the national anthem of the United States.
The fort was made a national park in 1925; on August 11, 1939, it was redesignated a "National Monument and Historic Shrine," the only such doubly designated place in the United States. It was placed on the National Register of Historic Places on October 15, 1966. It has become national tradition that when a new flag is designed it first flies over Fort McHenry. The first official 49 and 50 star American flags were flown over the fort and are still located on the premises.
The Fort has become a vital center of recreation for the Baltimore locals as well as a prominent tourist destination. Thousands of visitors come each year to see the "Birthplace of the Star Spangled Banner." It's easily accessible by Water Taxi from the popular Baltimore Inner Harbor, which increases its appeal with tourists.