Columbia subject headings:
Architecture, Medieval--Italy--Genazzano.
Castello Colonna (Genazzano, Italy)
Castles--Conservation and restoration--Italy--Genazzano.
Castles--Italy--Genazzano--Designs and plans.
Genazzano (Italy)--Buildings, structures, etc.
Harvard subject headings:
Castello Colonna (Genazzano, Italy)
Castles--Conservation and restoration--Italy--Genazzano.
Colonna family.
Genazzano (Italy)--Buildings, structures, etc.
Genazzano (Italy)--Buildings, structures, etc.--Conservation and restoration.
Princeton subject headings:
Architecture--Conservation and restoration--Italy--Genazzano.
Castello Colonna (Genazzano, Italy)
Castles--Italy--Genazzano.
Genazzano (Italy)--Buildings, structures, etc.