Black and white photograph of the Grand Canyon of the Yellowstone River. Taken by Robert Merrill from 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 north.

Canyon North of Leadville.

Overlooking Ouray, Colorado.

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 in portrait orientation of the Lower Falls from Red Rock, Yellowstone National Park.

Chaco Culture National Historical Park is located in northwestern New Mexico, between Albuquerque and Farmington. On March 11, 1907 Chaco Canyon was declared a national monument. In 1987, it was designated a World Heritage Site. The park preserves…

Chaco Culture National Historical Park is located in northwestern New Mexico, between Albuquerque and Farmington. On March 11, 1907 Chaco Canyon was declared a national monument. In 1987, it was designated a World Heritage Site. The park preserves…

Bandelier National Monument is located in Sandoval, Los Alamos, and Santa Fe Counties in New Mexico. It was designated a national monument in 1916. One of its principal features is Frijoles Canyon, containing ancestral pueblo homes and petroglyphs.…

Bandelier National Monument is located in Sandoval, Los Alamos, and Santa Fe Counties in New Mexico. It was designated a national monument in 1916. One of its principal features is Frijoles Canyon, containing ancestral pueblo homes and petroglyphs.…

Rio Grande Canyon south of Taos, New Mexico.