Ulysses S. Grant established the world's first national park with he signed an act establishing Yellowstone National Park on this day in 1872.  The park is primarily located in the state of Wyoming, but its vast land mass also stretches into Montana and Idaho.   Yellowstone sits atop a volcanic stratum and is widely known for its geothermal springs and geysers.  Many unique and once endangered species of animal like grizzly bears, wolves and bison call Yellowstone Park their home.