Black and white photograph of the Minute Man Geyser in eruption at Yellowstone National Park.

Black and white photograph of the Constant Geyser at Yellowstone National Park. Several people can be seen on the left side of the image observing the geyser erupt.

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…

Small geyser cone at Yellowstone National Park, Wyoming.

Castle Geyser in eruption at Yellowstone National Park, Wyoming.

Geyser cones at Yellowstone National Park, Wyoming.

Geyser cone at Yellowstone National Park, Wyoming.