Columbia subject headings:
Plazas--Spain--Catalonia.
Porticoes--Spain--Catalonia.
Public spaces--Spain--Catalonia.
Harvard subject headings:
Historic districts--Spain--Catalonia.
Plazas--Spain--Barcelona.
Plazas--Spain--Catalonia.
Plazas--Spain--Ciutadella.
Plazas--Spain--Girona.
Public spaces--Spain--Catalonia.
Princeton subject headings: