Bridges 152 History 36 Covered bridges 34 Design and construction 22 Railroad bridges 20 Law and legislation 11 Streets 11 more ... Cemeteries 10 Toll bridges 9 Recording 8 Ferries 7 Jewish 7 Roads 7 Suspension bridges 7 Buildings, structures, etc 6 Monuments & memorials 6 Railroads 6 Deportation 5 Historic bridges 5 Ponts 5 Delaware River Bridge 4 Description and travel 4 Floods 4 Labor unions 4 Philadelphia 4 Wooden bridges 4 Agriculture 3 Boundaries 3 Bridge building--19th century 3 Bridge laws and legislation 3 Bridges--Philadelphia, PA--19th century 3 Buildings 3 Canals 3 Church records and registers 3 Dams 3 Design 3 Highway law 3 Histoire 3 Hotels & taverns 3 Parks 3 less ...