Columbia subject headings:
Architecture, Medieval--Italy--Sicily.
Enna (Italy)--Buildings, structures, etc.
Nicosia (Italy)--Buildings, structures, etc.
Piazza Armerina (Italy)--Buildings, structures, etc.
Randazzo (Italy)--Buildings, structures, etc.
Harvard subject headings:
Architecture, Medieval--Italy--Sicily.
Architecture--Italy--Sicily.
Princeton subject headings:
Architecture, Medieval--Italy--Sicily.
Enna (Italy)--Buildings, structures, etc.
Nicosia (Italy)--Buildings, structures, etc.
Piazza Armerina (Italy)--Buildings, structures, etc.
Randazzo (Italy)--Buildings, structures, etc.