Yellowstone National Park is a national park located primarily in the US state of Wyoming, although it also extends into Montana and Idaho. It was established by the U.S. Congress and signed into law by President Ulysses S. Grant on March 1, 1872. Yellowstone is widely considered to be the first national park in the world, and it is famous for its geothermal features, including geysers, hot springs, and mud pots. The park also has a diverse array of wildlife, including bison, elk, wolves, and bears. Visitors to Yellowstone can enjoy hiking, camping, fishing, and many other recreational activities. Despite its popularity, the park remains a largely undeveloped wilderness, with most of its natural features preserved in their original state.