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(CC) Photo: James Phelps
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The Colorado river winds through Glen Canyon in northern Arizona.
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(CC) Photo: Thomas M Parsons
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The Seneca Rocks rise across the highway from the town of Mouth of Seneca, West Virginia.
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(CC) Photo: Thomas M Parsons
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The falls of the Cumberland River in the Cumberland Falls State Park in Kentucky.
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(CC) Photo: Wing-Chi Poon
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(CC) Photo: Wing-Chi Poon
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Large parts of the Rocky Mountains are characterized by untouched nature, such as the Glacier National Park, Montana.
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(GNU) Photo: Sascha Brück
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(CC) Photo: David Iliff
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Zion Canyon, Zion National Park, Utah
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