This late 18th century star-shaped fort is world famous as the birthplace of the United States' National Anthem. The guardian of Baltimore's Harbor from attacks coming up the Chesapeake, it was the valiant defense of Fort McHenry by American forces during a British attack on September 13-14, 1814, that inspired Francis Scott Key to write "The Star-Spangled Banner." Following the Battle of Baltimore during the War of 1812, the fort never again came under attack. However, it remained an active military post off and on for the next 100 years. In 1933 the fort became an area administered by the National Park Service, and of all the areas in the National Park System it is the only one designated as a national monument and historic shrine.