Columbia subject headings:
Architecture, Domestic--Italy--Piedmont--19th century--Congresses.
Castles--Remodeling for other use--Italy--Piedmont--Congresses.
Gothic revival (Architecture)--Italy--Piedmont--Congresses.
Harvard subject headings:
Architecture, Domestic--Italy--History.
Architecture--Italy--19th century.
Architecture--Italy--History--20th century
Castles--Italy--History.
Castles--Italy--Remodeling for other use.
Princeton subject headings: