Columbia subject headings:
Harvard subject headings:
Madrid (Spain)--Buildings, structures, etc.
Mansions--Spain--Madrid.
Palaces--Spain--Madrid.
Paseo de la Castellana (Madrid, Spain)
Princeton subject headings:
Madrid (Spain)--Buildings, structures, etc.
Mansions--Spain--Madrid.
Palaces--Spain--Madrid.
Paseo de la Castellana (Madrid, Spain)