Black and white photograph showing a wide shot of the Steel Arch Bridge at Niagara Falls.

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

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 the G.T. Bridge at Soulanges Canal, Québec.

Black and white photograph of the south abutment for Shelby Bridge under construction, New York State Canal System.

Black and white photograph of rocks at Point Sublime, taken by Robert Merrill from a stationary train.

Black and white photograph of rocks to the east of a summit. Railroad tracks can be seen through the rocky landscape.

Black and white lantern slide of a stone bridge with three arches crossing a river in China. A crowd of people and several wagons are visible aross the bridge, with a few on the bank of the river below.

Black and white photograph of river walls in Grand Rapids, Michigan, looking north. A bridge and city skyline are visible in the background.

Black and white photograph of a railroad bridge west of Cornorthwestall, Ontario. Taken by Robert Merrill, likely from a steamship.

Black and white photograph of the construction of an abutment for William's Bridge on the Erie Canal. Three men are visible on the top of the structure.

Black and white photograph of the north abutment of Shelby's Bridge, under construction.