Columbia subject headings:
Harvard subject headings:
Architecture--Italy--Palermo--History.
Gothic revival (Architecture)--Italy--Palermo.
Palermo (Italy)--Buildings, structures, etc.
Princeton subject headings:
Architecture--Italy--Palermo--History--19th century.
Architecture--Italy--Palermo--History--20th century.
Gothic revival (Architecture)--Italy--Palermo.
Palermo (Italy)--Buildings, structures, etc.