Columbia subject headings:
Gardens--Spain--Madrid--History.
Madrid (Spain)--History.
Retiro (Madrid, Spain)--History.
Harvard subject headings:
Gardens--Spain--Madrid--History.
Historic gardens--Spain--Madrid--History.
Madrid (Spain)--History.
Parks--Spain--Madrid--History.
Retiro (Madrid, Spain)--History.
Princeton subject headings:
Casón del Buen Retiro.
Gardens--Spain--Madrid.
Madrid (Spain)--Buildings, structures, etc.
Palaces--Spain--Madrid.
Park buildings--Spain--Madrid.
Parks--Spain--Madrid.