History 32 Buildings, structures, etc 10 Intellectual life 7 Architecture 5 City planning 5 Social conditions 5 Social life and customs 5 more ... Arts, American 4 Manners and customs 4 City and town life 3 Civil engineers 3 Description and travel 3 History and criticism 3 In literature 3 Politics and government 3 Skyscrapers 3 Transportation engineering 3 African Americans 2 Antiquities 2 Authors, French 2 Avant-garde (Music) 2 Characters 2 Composers 2 Design and construction 2 Diedrich Knickerbocker 2 Dutch 2 Economic assistance 2 Environmental aspects 2 Environmental conditions 2 Excavations (Archaeology) 2 less ...