Columbia subject headings:
Architecture, Medieval--Conservation and restoration--Italy--Palermo.
Castello a mare di Palermo--Conservation and restoration.
Fortification--Italy--Palermo.
Palermo (Italy)--Buildings, structures, etc.
Urban renewal--Italy--Palermo.
Harvard subject headings:
Princeton subject headings:
Castles--Italy--Palermo--Remodeling for other use.
Palermo (Italy)--Antiquities.