Columbia subject headings:
Fortification--Italy--Messina--History.
Military architecture--Conservation and restoration--Italy--Messina.
Harvard subject headings:
Princeton subject headings:
Calabria (Italy)--History, Military.
Fortification--Italy--Calabria--History.
Fortification--Italy--Messina, Strait of--History.
Fortification--Italy--Sicily--History.
Messina, Strait of (Italy)--History, Military.
Military architecture--Italy--Calabria.
Military architecture--Italy--Messina, Strait of.
Military architecture--Italy--Sicily.
Sicily (Italy)--History, Military.