Columbia subject headings:
Castles--Italy--Lazio.
Lazio (Italy)--Description and travel.
Lazio (Italy)--History.
Palaces--Italy--Lazio--History.
Harvard subject headings:
Castles--Italy--Lazio.
Lazio (Italy)--Description and travel.
Lazio (Italy)--History.
Palaces--Italy--Lazio--History.
Princeton subject headings:
Castles--Italy--Lazio.
Lazio (Italy)--Description and travel.
Lazio (Italy)--History.
Palaces--Italy--Lazio--History.