Black and white photograph of a landslide on the Chicago, Rock Island and Pacific Railroad. Taken by Robert Merrill from a moving train.

Black and white photograph of south culvert 103, New York State Canal System.

Black and white lantern slide of several people gathered around a shallow, smoking pit at the Solfatara volcano in Pozzuoli, Italy.

Black and white photograph of the Solfatara di Pozzuoli volcano fumerole "Boca Grande." A group of people is visible to the right of the Boca Grande. One person is standing in front of the Boca Grande, and a building is visible on the right side of…

Black and white photograph of the Solfatara di Pozzuoli volcanic mud pots.

Black and white photograph of the gravestone of Solomon Prentice which reads, "Here Lyes Y. Body of Mr. Solomon Prentice Sen Dead July 4th 1719 In the 73rd Year of His Age."

Black and white photograph of the G.T. Bridge at Soulanges Canal, Québec.

Black and white photograph of the south abutment for Gorman's Bridge, under construction. Three men and a child can be seen standing around the structure.

Black and white photograph of construction of the south abutment for Watson's Bridge, New York State Canal System.

Black and white lantern slide of two women and one boy standing next to a road in the South Dakota Badlands, with an automobile parked nearby.

Black and white lantern slide of an automobile parked along a roadway with the Black Hills of South Dakota in the background.

Black and white lantern slide of three women leaning against a wire railing next to an automobile on an overlook in the South Dakota Badlands.

Black and white lantern slide of two people sitting on a rock ledge and looking up at two carved busts of Mt. Rushmore.

Black and white lantern slide of the Needles rock formations in the Badlands of South Dakota.

Black and white photograph of Robert H. Merrill standing between a stone wall and columns in the Triangular Forum at Pompeii.

Black and white lantern slide of a water hoist wheel.

Black and white photograph of a mountain partially covered with trees.

Black and white photograph of a mountain partially covered with trees.

Black and white photograph of a stone cottage from the street. A group of people are visible standing on the porch.

Black and white photograph of a spinning wheel on the porch of a log cabin. Two women can be seen standing behind the spinning wheel.

Black and white photograph of a waterfall among boulders surrounded by trees. A wooden bridge is visible in the distance.

Black and white photograph of spoil in Hoffmans, New York.

Black and white photograph of the town square at Sorrento. Groups of people are walking around the square, and buildings are visible in the background.

Black and white photograph of the SS Montroyal, Canadian Pacific Line. Flags are strung between masts. "The Montroyal." is written on the bottom of the image.