The list of tunnels documented by the Historic American Engineering Record in Pennsylvania, which are located in various parts of the state, includes the Staple Bend Tunnel built in 1834 and Allegheny Tunnel built in 1854.
The list of tunnels documented by the Historic American Engineering Record in Pennsylvania, which are located in various parts of the state, includes the Staple Bend Tunnel built in 1834 and Allegheny Tunnel built in 1854.