America's 20 most-visited National Monuments
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10. Fort McHenry, Md.( Tom Darden / National Park Service )
Star-shaped Fort McHenry in Baltimore is best known its successful defense against the British navy in the 1814 Battle of Baltimore. The victory inspired Francis Scott Key to write a poem that would later become "The Star-Spangled Banner." Visitors can take a self-guided tour of the fort or attend an evening ceremony with the U.S. Navy Drill Team, Navy Band and hands-on flag folding. Travel in the spring or fall to avoid humid summers and cold winters, but expect windy conditions year-round.
Visitors in 2009: 605,870
More information: http://www.nps.gov/fomc