Columbia subject headings:
Harvard subject headings:
Castles--Italy--Piedmont--History.
Nobility--Italy--Piedmont--History.
Piedmont (Italy)--History.
Roads--Italy--Piedmont--History.
Strada di Francia (Italy and France)--History.
Princeton subject headings:
Castles--Italy--Piedmont--Guidebooks.
Guidebooks.
Piedmont (Italy)--Buildings, structures, etc.
Piedmont (Italy)--Description and travel.