From a naval vessel offshore in the Patapsco River, Francis Scott Key witnessed the 25-hour bombardment of this late 18th-century star-shaped fort at the entrance to
Baltimore's Inner Harbor. A barrage of 1,500 to 1,800 bombs, rockets and shells was fired until after midnight. In the morning, when he saw the stars and stripes still waving, Key began to write the immortal lines of the National Anthem on the back of a letter.
Fort McHenry is the only area in the National Park System designated a national monument and historic shrine. The year-round visitors center contains various exhibits on fort history and the War of 1812; group tours are available. The Star Fort Museum, within 200 yards of the Fort McHenry Visitor Center, exhibits historical and military memorbilia with new exhibits in the Commander's Quarters, Guard House, and restored barracks and flagpole.