Columbia subject headings:
Castles--Italy--Todi.
Todi (Italy)--Antiquities.
Todi (Italy)--History.
Harvard subject headings:
Castles--Italy--Todi.
Todi (Italy)--Antiquities.
Todi (Italy)--History.
Princeton subject headings:
Castles--Italy--Todi.
Todi (Italy)--Antiquities.
Todi (Italy)--History.