Geyser cone at Yellowstone National Park, Wyoming.

Geyser cones at Yellowstone National Park, Wyoming.

Castle Geyser in eruption 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 the Constant Geyser at Yellowstone National Park. Several people can be seen on the left side of the image observing the geyser erupt.

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

Black and white photograph of the Old Faithful geyser in eruption, Yellowstone National Park.

Black and white photograph of the Beehive Geyser before eruption, Yellowstone National Park. A man and a woman are standing near the geyser.

Black and white photograph of the Beehive Geyser in eruption, Yellowstone National Park. Lena Billington Merrill can be seen at a short distance from the geyser.

Black and white photograph of the Beehive Geyser, Yellowstone National Park, with Lena Billington Merrill facing the camera.