Columbia subject headings:
Archaeology, Medieval.
Basements--Italy--Viterbo (Province)
Excavations (Archaeology)--Italy--Viterbo (Province)
Extinct cities--Italy--Viterbo (Province)
Viterbo (Italy : Province)--Antiquities.
Harvard subject headings:
Castro site (Italy)--Antiquities.
Excavations (Archaeology)--Italy
Italy--Antiquities.
Princeton subject headings:
Castro (Italy)--History.
Excavations (Archaeology)--Italy--Castro.
Tuscany (Italy)--History.