Columbia subject headings:
Architecture--Italy--Rome.
Palaces--Italy--Rome.
Palatine Hill (Italy)
Rome (Italy)--Buildings, structures, etc.
Harvard subject headings:
Architecture--Italy--Rome
Palaces--Italy--Rome
Palatine Hill (Italy)
Rome (Italy)--Buildings, structures, etc.
Princeton subject headings:
Architecture, Classical--Italy--Rome.
Palaces--Italy--Rome--Designs and plans.
Rome (Italy)--Buildings, structures, etc.