The 20 most-visited national parks in the U.S.
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( Mark Boster / Los Angeles Times )
Visitors in 2009 (through August): 3.2 million
Established in 1919, the Grand Canyon is perhaps the most famous of America's national parks. It is an enormous stretch of canyon: 277 miles long (measured by the length of the river at its bottom), 6,000 vertical feet at its deepest and as much as 18 miles across in some places. It takes about two days to get to the bottom of the canyon and back on foot. And it receives close to 5 million visitors each year.
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