Roman Theatre , on the right side of Piazza della Libertà. It was built in the first century A.D. on an artifical platform and restored in Roman times. In time it was enveloped by the surrounding buildings. It was unearthed at the end of the nineteenth century and fully restored. From 1954 on it has been used for open-air shows, especially during the Festival of the Two Worlds. The orchestra pit and part of the flooring, the first two rows of seating, the façade with blind arches and half-columns, the ambulacrum with barrel-vaults and the corridors are all original. The current seating arrangement was re-built in both stone and cement according to the traces remaining. The back-drop was destroyed plausibly when the apse of the former church of Sant'Agata was built in the street beind it. In the monastery built on to the church whose cloister closes off the theatre on one side, the National Archeological Museum was built. This is where numerous archeological findings are housed including inscriptions, an impressive series of portraits and the interesting documentation concerning the excavations carried out within the city and the relative findings dating back to pre-historical times.