America's 20 most-visited National Monuments

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 20. Fort Frederica National Monument, Ga.19. Little Bighorn Battlefield National Monument, Mont.18. Governors Island National Monument, N.Y.17. Organ Pipe Cactus National Monument, Ariz.16. Devils Tower National Monument, Wyo.15. Colorado National Monument, Colo.14. Fort Pulaski National Monument, Ga.13. White Sands National Monument, N. M.12. Cedar Breaks National Monument, Utah11. Montezuma Castle National Monument, Ariz.10. Fort McHenry, Md.9. Castillo de San Marcos, Fla.8. Cabrillo National Monument, Calif.7. Muir Woods, Calif.6. Fort Sumter, S.C.5. Fort Matanzas, Fla.4. Canyon de Chelly, Ariz.3. World War II Valor in the Pacific, Oahu, Hawaii2. Statue of Liberty, N.Y., N.J.1. Castle Clinton, N.Y.

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.<br>
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Visitors in 2009: 605,870<br>
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More information: <a href="http://www.nps.gov/fomc">http://www.nps.gov/fomc</a>

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