Yellowstone National Park was the first national park in the world, and larger than some U.S. states. And 90 percent of the park has barely been touched. And underneath Yellowstone, lies one of the world's largest volcanoes.
Last EpisodeTV Special: Yellowstone: America's … Aired: Apr. 24, 2013
Highlights include the world's most extraordinary collection of geysers, hot springs and bubbling mud pools, the Grand Canyon of the Yellowstone …
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