The 20 most-visited national parks in the U.S.
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12. Joshua Tree National Park( Christopher Reynolds / Los Angeles Times )
Visitors in 2009 (through August): 875,666
Joshua Tree is home to an impressive collection of wildflowers, world-class rock-climbing and amazing rock formations. On the park's nearly 800,000 acres are 501 archaeological sites, a dozen self-guided nature hikes and 700 species of vascular plants and 88 historic structures.
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