Roman amphitheatre. In via dell'Anfiteatro, first section of the National Cross-Road mentioned above. Only now partially visible inside the former Minervio barracks, this is a striking building with two orders of arches. Long sections of the lower ambulacrum, together with a part of the upper ambulacrum, can still be seen. It was built in the second century A.D. but was turned into a fortress by Totila in 545. During the early middle ages it was used for shops and storage. In the twelfth century the cavea and arena were taken over by the church of St Gregory Minor and, later still, by a monastery.