Columbia subject headings:
Ostia (Italy)--Antiquities.
Harvard subject headings:
Architecture, Roman--Italy--Ostia (Extinct city)
Building, Brick--Italy--Ostia (Extinct city)
Excavations (Archaeology)--Italy--Ostia (Extinct city)
Italy--Antiquities, Roman
Italy--Antiquities.
Ostia (Extinct city)
Ostia (Extinct city)--Buildings, structures, etc.
Princeton subject headings:
Excavations (Archaeology)--Italy--Ostia (Extinct city).
Ostia (Extinct city)