Yosemite's Half Dome at sunsetPhotograph: Shubroto Chattopadhyay/CorbisA climber scales the 1,000-plus vertical metres of the Nose of El Capitan, Yosemite National Park, CaliforniaPhotograph: Galen Rowell/CorbisBear fishing for salmon in Brooks River, Katmai National Park, AlaskaPhotograph: Paul A. Souders/Corbis
Mist in Great Smoky Mountains National Park, North Carolina/Tennessee borderPhotograph: Jay Dickman/CorbisA cabin deep in the forest, Great Smoky Mountains National Park, TennesseePhotograph: Gary Braasch/CorbisGrand prismatic spring in Yellowstone National Park, Wyoming Photograph: Momatiuk - Eastcott/CorbisThe Subway in Utah's Zion National Park is a tunnel-like slot canyon, sculpted over time by water and windPhotograph: G. Brad Lewis/Science Faction/CorbisRafting on the Colorado River through the Grand Canyon, ArizonaPhotograph: Kevin Fleming/CorbisAutumn colours in New River Gorge national park, West VirginiaPhotograph: David Muench/CorbisGiant sequoia trees, Sequoia National Park, CaliforniaPhotograph: Gavin Hellier/Robert Harding World Imagery/CorbisLooking out from under canvas at the mountains of Kings Canyon National Park, CaliforniaPhotograph: Kelly Harriger/CorbisGrand Teton National Park, Wyoming, USA Photograph: Buddy Mays/CorbisThe Teton Range reflected in Jenny Lake Photograph: Michael T. Sedam/CorbisCalm waters in Acadia National Park, MainePhotograph: Blaine Harrington III/CorbisAcadia National Park's coast in autumnPhotograph: Karl Kinne/Corbis
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