America's 20 most-visited National Monuments
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16. Devils Tower National Monument, Wyo.( Colin Faulkingham )
The first of all the national monuments, Devils Tower was created by Theodore Roosevelt in 1906. Its name comes from the 1,267-foot-tall rock formation that was a sacred site for many Native American tribes.Today the park attracts mountain climbers from around the world who try to scale the tower's vertical walls as well as to enjoy the park's woodlands, grasslands and pine forests.
Visitors in 2009: 391,023
More info: http://www.nps.gov/deto/index.htm