Columbia subject headings:
Gardens, Spanish--Spain--Madrid.
Gardens--Spain--Madrid.
Madrid (Spain)--Buildings, structures, etc.
Harvard subject headings:
Architecture, Modern--Spain--Madrid.
Buen Retiro (Madrid, Spain)--History.
Gardens--Spain--Madrid.
Madrid (Spain)--Buildings, structures, etc.
Princeton subject headings:
Gardens, Spanish--Spain--Madrid.
Gardens--Spain--Madrid.
Madrid (Spain)--Buildings, structures, etc.