Black and white photograph of the Fountain Geyser at Yellowstone National Park. Steam is rising from the geyser, and a pine tree stands between the geyser and the photographer.

Black and white photograph of the active Jewel Geyser in front of a forest at Yellowstone National Park.

Black and white photograph of the Norris Geyser Basin, Yellowstone National Park. Taken by Robert Merrill, looking north. Several figures can be seen at a long distance. Water damage is visible on the image, which was scanned from the negative.

Black and white photograph of the Norris Geyser Basin, Yellowstone National Park. Taken by Robert Merrill, looking northeast. A man can be seen standing at the left of the image, and a horse-drawn carriage appears to be driving up the road from the…

Black and white photograph of the Daisy Geyser in eruption, Yellowstone National Park. A man is seen walking next to the geyser.

Black and white photograph of the Riverside Geyser in eruption, Yellowstone National Park. Taken by Robert Merrill looking southeast.

Black and white photograph of the Riverside Geyser in eruption, Yellowstone National Park. A group of people are standing and watching the geyser erupt. Taken by Robert Merrill looking east.

Black and white photograph of the Grotto Geyser at rest, Yellowstone National Park.

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

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 before eruption, Yellowstone National Park. A man and a woman are standing near the geyser.

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

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.