Black and white photograph of a group of three men at the Manitou Cliff Dwellings. Several petroglyphs can be seen to the left of the group.

Black and white photograph of a group of three men in the Curtain Hall Cave of the Winds, Manitou Springs, Colorado.

Black and white photograph of a group of three men standing on a bridge at Helen Hunt Falls in North Cheyenne Canyon, Colorado Springs, Colorado.

Black and white photograph of five people, three men and two women, standing on Point Lookout.

Black and white photograph of horseshoe bend roadway near Manitou Springs, Colorado.

Black and white photograph over the landscape looking south to Manitou Springs, Colorado.

Black and white photograph of a stairway of a stone building. A plaque on the second step reads, "The Top of this Step is One Mile above Sea-Level."

Black and white photograph of the east cliff face at Ute Pass.

Black and white photograph of William's Canyon from above. A building is visible on top of the mountain opposite the photographer with the word "CAVE" painted on its side.

Black and white lantern slide of a road winding through the Hot Sulphur Springs Canyon in Colorado.

Black and white lantern slide of old lava flows on Purple Mountain in Colorado.

Black and white lantern slide of a cliff dwelling in Mesa Verde National Park, looking north.

Black and white lantern slide close up view of a cliff dwelling in Mesa Verde National Park.

Black and white lantern slide close up view of a cliff dwelling in Mesa Verde National Park, looking north.

Black and white lantern slide of "Fat Man's Misery" section of the Square Tower House at Mesa Verde National Park.

Black and white lantern slide close up view of a wooden ladder at the Square Tower house at Mesa Verde National Park.

Black and white lantern slide view of Nymph Lake in Rocky Mountain National Park, with mountains rising in the background.

Black and white lantern slide of the terraced landscape near Cedar Tree House at Mesa Verde National Park.

Black and white photograph of a large stone cathedral. The cathedral has three large doors and two bell towers. "Columbus Cathedral Havana" is written on the bottom of the image.

Black and white lantern slide of a Confucian shrine at the top of a large hill near Mount Tai, China.

Black and white lantern slide of a Chinese man standing next to a Confucian monument in Shantung (Shandong), China.

Black and white lantern slide of a Confucian temple in Shantung (Shandong), China.

Black and white lantern slide of the rocky steps up a mountainside to a Confucian shrine near Mount Tai, China.

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.