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This clip features a warning sign that says, "Danger - Trail Closed Do Not Pass." It was posted near the iconic Old Faithful geyser at Yellowstone National Park.Yellowstone National Park is located largely in the northwestern corner of Wyoming but extends into Montana and Idaho.The U.S. Congress and President Ulysses S. Grant established Yellowstone in 1872, making it the first national park in the U.S. It is also widely held to be the first national park in the world.The park is known for its wildlife like bison, bear, elk, and wolf, and its many geothermal features, especially the Old Faithful geyser, one of its most popular. Other notable sites include Lake Yellowstone and the Grand Canyon of Yellowstone.