Columbia subject headings:
Fortification--Italy--Sardinia.
Nuraghi.
Sardinia (Italy)--Antiquities.
Symbolism in architecture.
Towers--Italy--Sardinia.
Harvard subject headings:
Fortification--Italy--Sardinia.
Nuraghi
Sardinia (Italy)--Antiquities.
Symbolism in architecture.
Towers--Italy--Sardinia.
Princeton subject headings: