Yellowstone National Park

The world's first national park (1872) sits atop a supervolcano in Wyoming, USA, spanning 8,983 sq km. Home to more than 10,000 geothermal features — including Old Faithful — representing half the world's geysers in one place. Yellowstone protects the largest bison herd in North America alongside wolves, grizzly bears, and bald eagles in one of the most ecologically intact temperate ecosystems on the planet.