Yellowstone National Park

Old Faithful Geyser, the first geyser in the park to be named erupts in Yellowstone National Park, Wyoming, June 22, 2011. Currently the geyser erupts approximately every 90 minutes. REUTERS/Jim Urquhart

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Signed into law by President Ulysses S. Grant on March 1, 1872, Yellowstone National Park attracts 3.5 million visitors every year and employs over 400 seasonal employees.

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