Region
United States
Pennsylvania
5
Philadelphia
3
Delaware
2
Boston
1
Boston (Mass.)
1
Brooklyn Bridge (New York, N.Y.)
1
Delaware River
1
Delaware River (N.Y.-Del. and N.J.)
1
Indiantown Gap Military Reservation (Pa.)
1
Massachusetts
1
Pennsylvania Turnpike (Pa.)
1
Philadelphia Region
1
Pittsburgh
1
Pittsburgh (Pa.)
1
Schuylkill River
1
Sixth Street Skew Arch Bridge (Reading, Pa.)
1
Virginia
1
Washington Crossing Memorial Bridge (Pittsburgh, Pa.)
1
Williamsburg (Va.)
1