The Roman amphitheatre, located next to Piazza Sant’Oronzo, is the largest in the Apulia region and was built in the 2nd century CE. It was discovered by chance by workers laying foundations for a new building as part of renovations to the square.

Estimates suggest it could hold between 15,000 and 20,000 spectators (possibly even more), but today, only part of it is visible, as it has not been fully excavated and remains buried beneath other buildings and the Church of Santa Maria della Grazia.

The excavation, led by Apulian archaeologist Cosimo De Giorgi, was halted in 1940. Today, visitors can see the arena, some of the seating tiers (tribunes), and remnants of the surrounding wall.