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.

Organ Pipe Cactus National Monument is named for the long, thin cacti that dot this desert landscape. But within the park visitors will find more than two dozen species of cactus and animals like the mountain lion and kangaroo rat that have adapted to the harsh habitat. This park is probably best visited in the winter when temperatures are in the 50s and 60s. In the summer temperatures often rise to over 100 degrees.<br>
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Visitors in 2009: 330,064<br>
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More info: <a href="http://www.nps.gov/orpi/index.htm">http://www.nps.gov/orpi/index.htm</a>

17. Organ Pipe Cactus National Monument, Ariz.

( Joshua Bo / National Park Service )

Organ Pipe Cactus National Monument is named for the long, thin cacti that dot this desert landscape. But within the park visitors will find more than two dozen species of cactus and animals like the mountain lion and kangaroo rat that have adapted to the harsh habitat. This park is probably best visited in the winter when temperatures are in the 50s and 60s. In the summer temperatures often rise to over 100 degrees.

Visitors in 2009: 330,064

More info: http://www.nps.gov/orpi/index.htm