Columbia subject headings:
Architecture, Modern--20th century.
Architecture, Modern--21st century.
Plazas.
Public architecture.
Public spaces.
Harvard subject headings:
Architecture, Modern--21st century
Plazas.
Public spaces.
Space (Architecture)
Princeton subject headings:
Architecture, Modern--20th century.
Architecture, Modern--21st century.
Plazas.
Public architecture.
Public spaces.