Columbia subject headings:
Hadrian's Villa (Tivoli, Italy)
Hadrian, Emperor of Rome, 76-138--Homes and haunts--Italy--Tivoli.
Tivoli (Italy)--Buildings, structures, etc.
Harvard subject headings:
Hadrian's Villa (Tivoli, Italy).
Hadrian,--Homes and haunts--Italy--Tivoli.
Tivoli (Italy)--Antiquities, Roman.
Princeton subject headings: