Columbia subject headings:
Architecture--Spain--Barcelona--History--21st century--Designs and plans.
Architecture--Spain--Barcelona--History--21st century.
City planning--Spain--Barcelona--History--21st century.
Harvard subject headings:
Architecture--Spain--Barcelona--History--21st century.
Barcelona (Spain)--Buildings, structures, etc.
City planning--Spain--Barcelona--History--21st century.
Princeton subject headings:
Architecture--Spain--Barcelona--History--21st century--Designs and plans.
City planning--Spain--Barcelona--History--21st century.