Yellowstone National Park offical site:

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Yellowstone National Park

Established in 1872, Yellowstone National Park is America's first national park.

Located in Wyoming, Montana, and Idaho, it is home to a large variety of wildlife including grizzly bears, wolves, bison, and elk.

Preserved within Yellowstone National Park are Old Faithful and a collection of the world's most extraordinary geysers and hot springs, and the Grand Canyon of the Yellowstone.

http://www.nps.gov/yell/