It’s one of the most emblematic evidence of the old city, covered by the new, rebuilt after eruptions and earthquakes. In the central Piazza Stesicoro, at a level lower than the street level, there are the ruins of the Roman Amphitheatre (you can also see the ruins of the Colosseum away, small weir in Via Manzoni), which in its heyday could hold up to 15000 spectators, with its outer circumference of 309 meters, can be considered one of the largest Roman amphitheatres in Italy, second only to the Colosseum in Rome. Was most likely built in the middle of the second century AD, but already between the fifth and sixth centuries of the local population began to extract stones and materials for the construction of other buildings, including the Cathedral of Saint Agatha, on whose apses you may find that transposition. It was in 1904 that was made in view of the now visible in Piazza Stesicoro. The original structure of the auditorium, which had 14 steps, remain visible corridor that separated from the hill behind the amphitheater, part of the outer arcades, arches and some great times with the function of support of the stairs and interior corridors. The excavation of the Amphitheatre is accessed through an iron gate decorated with arches pierced.