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 Lower Falls, Yellowstone National Park. Taken by Robert Merrill, looking down from brink.

Black and white photograph of Gibbon Falls in Yellowstone National Park.

Black and white photograph of Gibbon Falls in Yellowstone National Park. Gibbon Falls is surrounded by mountains and forest.

Black and white photograph of Golden Gate Canyon at Yellowstone National Park. Taken by Robert Merrill, looking south.

Black and white photograph in portrait orientation of the Grand Canyon of the Yellowstone River, Yellowstone National Park. Taken by Robert Merrill, looking east below Grand View.

Black and white photograph in portrait orientation of the Grand Canyon of the Yellowstone River, Yellowstone National Park. Taken by Robert Merrill, looking south from Inspiration Point.

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 Grotto Geyser at rest, Yellowstone National Park.

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

Black and white photograph of Hymen Terrace, Yellowstone National Park. Two women can be seen standing in the foreground of the image.

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