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Yellowstone National Park
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Published April 17, 2016
Established in 1872, it was the first national park in the United States, and perhaps the world. Its geological and biological wonders have led international groups to declare it a world heritage site and a biosphere reserve.
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Grand Teton National Park
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Published April 10, 2016
A long, active geologic history sculpted the surface features visible today in the Teton mountain range and Jackson Hole valley.
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