The Amphithéâtre gallo-romain stands on a hillside north of the old town, a large oval arena dating from the 1st century AD that is one of the best-preserved Roman amphitheatres in France. Unlike its counterparts in Arles or Nîmes, it was never adapted for other uses — it simply fell out of use and was gradually covered by earth, which paradoxically protected the underlying structure. Excavations in the 19th and 20th centuries revealed the entrance vaults, the arena floor, and much of the seating structure in good condition.
The setting — green tiers of grass-covered seats, stone entrance vaults, an open sky above — is evocative of the Roman past in a way that feels more immediate than many larger sites. Today the amphitheatre is used for summer concerts and events, which means the acoustics are tested regularly and found to be excellent. The surrounding park is pleasant to walk in even outside event periods; the views back over the town are good.