Columbia subject headings:
Fortezza vecchia (Livorno, Italy)--History.
Livorno (Italy)--History.
Harvard subject headings:
Fortezza vecchia (Livorno, Italy)
Fortification--Italy--Livorno--History.
Livorno (Italy)--Buildings, structures, etc.
Military architecture--Italy--Livorno.
Princeton subject headings:
City walls--Italy--Livorno.
Fortezza Vecchia di Livorno.
Fortification--Italy--Livorno.