Columbia subject headings:
Architecture, Domestic--Spain--History.
Castile (Spain)--History.
Castles--Spain.
Spain--History.
Harvard subject headings:
Architecture, Domestic--Spain--History.
Castile (Spain)--History.
Castles--Spain
Spain--History.
Princeton subject headings:
Architecture, Domestic--Spain--History.
Castile (Spain)--History.
Castles--Spain.
Spain--History.