Columbia subject headings:
Architecture--Spain--Madrid--History--20th century--Exhibitions.
Architecture--Spain--Madrid--History--21st century--Exhibitions.
Gran Vía (Madrid, Spain)--Exhibitions.
Harvard subject headings:
Architecture--Spain--Madrid--20th century--Exhibitions.
Architecture--Spain--Madrid--21st century--Exhibitions.
City planning--Spain--Madrid
Gran Vía (Madrid, Spain)--Exhibitions.
Princeton subject headings: