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Yellowstone National Park, established by the U.S. Congress and signed into law by President Ulysses S. Grant on March 1, 1872, is a national park located primarily in the U.S. state of Wyoming, though it also extends into Montana and Idaho. Yellowstone was the first national park in the world, and is known for its wildlife and its many geothermal features, especially Old Faithful Geyser, one of the most popular features in the park. It has many types of ecosystems, but the subalpine forest is dominant.

Yellowstone National Park spans an area of 3,468 square miles (8,980 km2), comprising lakes, canyons, rivers and mountain ranges. Yellowstone Lake is one of the largest high-altitude lakes in North America and is centered over the Yellowstone Caldera, the largest supervolcano on the continent. The caldera is considered an active volcano. It has erupted with tremendous force several times in the last two million years. Half of the world's geothermal features are in Yellowstone, fueled by this ongoing volcanism. Lava flows and rocks from volcanic eruptions cover most of the land area of Yellowstone. The park is the centerpiece of the Greater Yellowstone Ecosystem, the largest remaining, nearly intact ecosystem in the Earth's northern temperate zone.

Hundreds of species of mammals, birds, fish and reptiles have been documented, including several that are either endangered or threatened. The vast forests and grasslands also include unique species of plants. Yellowstone Park is the largest and most famous megafauna location in the Continental United States. Grizzly Bears, wolves, and free-ranging herds of bison and elk live in the park. The Yellowstone Park Bison Herd is the oldest and largest public bison herd in the United States

East Yellowstone Valley - Pahaska Tepee LodgeEast Yellowstone Valley - Pahaska Tepee LodgeEast Yellowstone Valley - Horses in Pahaska Tepee LodgeYellowstone National Park' sign in East EntranceSylvan LakeSylvan LakeSylvan LakeYellowstone LakeView from Fishing BridgeHayden ValleyAmerican BisonsGrand Canyon of the Yellowstone - Lower Falls from Artist PointGrand Canyon of the Yellowstone - Lower FallsGrand Canyon of the Yellowstone - Lower FallsGrand Canyon of the Yellowstone - Painted WallsYellowstone RiverMammoth Hot SpringsMammoth Hot SpringsMammoth Hot SpringsYellowstone Mammoth Hot Springs - Minerva Terraces