Buildings, structures, etc History 70 Buildings 37 Historic buildings 33 Architecture 22 Hotels 20 Social life and customs 10 more ... Conservation and restoration 9 Historic sites 8 Histoire 7 Railroads 6 Statues 6 Architecture, Domestic 5 Historic houses, etc 5 Liberty Bell 5 Architectural & Industrial 4 Architecture, Victorian 4 Biography 4 Design and construction 4 HISTORY 4 Homes and haunts 4 Mansions 4 Middle Atlantic (DC, DE, MD, NJ, NY, PA) 4 Neighborhoods 4 PHOTOGRAPHY 4 Pictorial works 4 State & Local 4 Subjects & Themes 4 William Penn Statue (City Hall, Philadelphia, Pa.) 4 Architecture, Modern 3 Auditoriums 3 Church schools 3 Dwellings 3 Exhibitions 3 Public buildings 3 Sculpture 3 Walking 3 ARCHITECTURE 2 Abandoned buildings 2 Apartment houses 2 less ...