Hayden Valley and Lamar Valley are often called America's Serengeti.

Yellowstone National Park is America's first national park established by US Congress and signed by Ulysses S. Grant on March 1, 1872. Yellowstone is mostly located in Wyoming and small parts in Idaho and Montana. The park is known for it's wildlife and many geothermal features, especially one of it's most popular Old Faithful Geyser.