Columbia subject headings:
Forte di Nettuno (Nettuno, Italy)
Fortification--Italy--Nettuno--History.
Harvard subject headings:
Architecture, Renaissance--Italy--Nettuno.
Architecture--Conservation and restoration--Italy--Nettuno.
Military architecture--Italy--Nettuno.
Nettuno (Italy)--Buildings, structures, etc.
Princeton subject headings:
Architecture, Medieval--Conservation and restoration--Italy--Como Region.
Fortification--Conservation and restoration--Italy--Nettuno.