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

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 a large cottage opposite Pullman Island, Alexandria Bay, New York. A bridge is visible next to the cottage. Water damage is visible on the image, which was scanned from the negative.

Black and white photograph of a Mississippi River bridge at Dubuque, Iowa. Water damage is visible on the image, which was scanned from the negative.

Black and white photograph of a Mississippi River bridge at Winona, Minnesota. Water damage is visible on the image, which was scanned from the negative.

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

Black and white photograph of a train crossing a curved trestle bridge.

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

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 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 north abutment of Shelby's Bridge, under construction.

Black and white photograph of the construction of Vernon Street Bridge, Milleport.