Columbia subject headings:
Architecture, Phoenician--Italy--Palermo.
Architecture--Italy--Palermo--History.
Islamic architecture--Italy--Palermo.
Palermo (Italy)--Antiquities.
Palermo (Italy)--Boundaries--History.
Palermo (Italy)--Buildings, structures, etc.
Towers--Italy--Palermo--History.
Harvard subject headings:
Architecture, Phoenician--Italy--Palermo.
Architecture--Italy--Palermo--History.
Islamic architecture--Italy--Palermo.
Palermo (Italy)--Antiquities.
Palermo (Italy)--Boundaries--History.
Palermo (Italy)--Buildings, structures, etc.
Towers--Italy--Palermo--History.
Princeton subject headings:
Architecture, Phoenician--Italy--Palermo.
Architecture--Italy--Palermo--History.
Islamic architecture--Italy--Palermo.
Palermo (Italy)--Antiquities.
Palermo (Italy)--Boundaries--History.
Palermo (Italy)--Buildings, structures, etc.
Towers--Italy--Palermo--History.