Historic buildings 41 History 35 Buildings, structures, etc 21 Church buildings 13 Streets 12 Description and travel 11 Buildings 9 more ... Architecture 7 Historic sites 7 Centennial Exhibition (1876 : Philadelphia, Pa.) 6 Architecture, Domestic 5 Design and construction 5 Hotels 5 Homes and haunts 4 Hospitals 4 Jews 4 Philadelphia (Pa.)--Politics and government--20th century 4 Railroads 4 Religious life 4 Restaurants 4 AIDS (Disease) 3 African Americans 3 Anglican church buildings 3 Bridges 3 COVID-19 (Disease) 3 City planning 3 Clubs and Associations--20th Century 3 Coal mines and mining--Pennsylvania 3 Conservation and restoration 3 Exhibitions 3 Family life--Personal correspondence--20th century 3 Genealogy 3 Historic buildings, etc 3 History and criticism 3 Parks 3 Pennsylvania--Genealogy 3 Philadelphia 3 Philadelphia (Pa.)--City government--20th century 3 Philadelphia (Pa.)--Officials and employees 3 Philadelphia (Pa.)--Social conditions--20th century 3 less ...