Columbia subject headings:
Architecture, Medieval--Italy--Sardinia.
Castles--Italy--Sardinia.
Fortification--Italy--Sardinia.
Harvard subject headings:
Architecture, Medieval--Italy--Sardinia.
Castles--Italy--Sardinia.
Sardinia (Italy)--History--Aragonese and Spanish rule, 1297-1708.
Princeton subject headings:
Castles--Italy--Sardinia--Pictorial works.
Sardinia (Italy)--History--Aragonese and Spanish rule, 1297-1708.