
GRAND CANYON, AZ - JUNE 10: Shafts of light pass over the Bright Angel Fault inside the Grand Canyon early June 10, 2009 in the Grand Canyon National Park, Arizona. Work began this week with federal stimulus money to repair the scenic South Kaibab Trail in the park. The work will be the biggest trail reconstruction project in the Grand Canyon since the 1960s and the first there to use some of the $10.8 million in economic stimulus money granted by Congress for projects in the park. Some 4.5 million people visit the Grand Canyon each year, making it the most visited destination park in the United States. The six million year old canyon averages 10 miles wide and a mile deep and is considered my many the most spectacular national wonder in America. (Photo by John Moore/Getty Images)
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Top 10: Park passion
The National Park Service celebrates its centennial this year with special events at parks across the nation. About 70 million outdoors enthusiasts visited a national park in 2014, and 2015 figures will be out later this year. Meanwhile, NationalGeographic.com has composed a Top 10 list of the country's most popular parks, from the Great Smoky Mountains (more than 10 million visitors) to Glacier National Park (2.3 million).
1 Great Smoky Mountains, North Carolina and Tennessee
2 Grand Canyon, Arizona
3 Yosemite, California
4 Yellowstone, Wyoming, Idaho and Montana
5 Rocky Mountain, Colorado
6 Olympic, Washington
7 Zion, Utah
8 Grand Teton, Wyoming
9 Acadia, Maine
10 Glacier, Montana
-- Jackie Burrell, Staff