Columbia subject headings:
Castles in art.
Castles--Italy--Piedmont--History.
Piedmont (Italy)--In art.
Harvard subject headings:
Castles--Italy--Piedmont--History.
Castles--Italy--Piedmont--Pictorial works.
Princeton subject headings:
Castles--Italy--Piedmont--History.
Castles--Italy--Piedmont--Pictorial works.