Topics Technology & Engineering

Thomas Mill Covered Bridge on the Wissahickon

Thomas Mill Covered Bridge over Wissahickon Creek (Picturesque America)

Black and white photo of a man wearing a hat and standing on a bridge with his arm on a post

Wood truss drawbridge, Orthodox Street over Frankford Creek, 1899 [Detail]

Black and white photo of a low bridge over a creek

Bridge Street Draw, July 26, 1897

View from the Inclined Plane, near Philadelphia, 1838

View from the Inclined Plane near Philadelphia, 1838

Tinted image of a single-arch bridge over a river with landscape in the distance

Lancaster/Schuylkill Bridge (Upper Ferry Bridge)