Columbia subject headings:
Castles--Italy--Valle d'Aosta.
Historic buildings--Italy--Valle d'Aosta.
Valle d'Aosta (Italy)--Description and travel.
Harvard subject headings:
Castles--Italy--Valle d'Aosta.
Historic buildings--Italy--Valle d'Aosta.
Valle d'Aosta (Italy)--Description and travel.
Princeton subject headings: