In Roman Gaul, every important town had an amphitheatre, where gladiators and wild animals met their (usually grisly) ends. Few examples have survived, but Arles (like nearby Nîmes) has preserved its colosseum largely intact. At 136m long, 107m wide and 21m tall, built around AD 90, the oval-shaped amphitheatre would have held 21,000 baying spectators. Though the structure has suffered down the centuries, it's still evocative of the might and capabilities of Roman civilisation. Entry is on the northern side.