Geyser cone at Yellowstone National Park, Wyoming.

Mammoth Hot Springs at Yellowstone National Park, Wyoming.

Geyser cones at Yellowstone National Park, Wyoming.

Boiling Spring at Yellowstone National Park, Wyoming.

Castle Geyser in eruption at Yellowstone National Park, Wyoming.

Shoshone Dam near the entrance to Yellowstone Park, Wyoming.

Bridge over Yellowstone River above the falls at Yellowstone National Park, Wyoming.

Small geyser cone at Yellowstone National Park, Wyoming.

Yellowstone National Park is located primarily in Wyoming, but extends into parts of Montana and Idaho. Established as a National Park on March 1, 1872, it was the first national park in the world. It is known for its large variety of wildlife and…

Yellowstone National Park is located primarily in Wyoming, but extends into parts of Montana and Idaho. Established as a National Park on March 1, 1872, it was the first national park in the world. It is known for its large variety of wildlife and…

Black and white photograph of several people at the top of Jupiter Terrace at Yellowstone National Park.

Black and white photograph of a group of seventeen people at Angel's Rest, Yellowstone National Park.