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The Colosseum
Ancient Rome
The Flavian Amphitheatre opened in AD 80 and held somewhere between 50,000 and 80,000 spectators for gladiatorial games, animal hunts and public executions. What survives is essentially the skeleton: the marble facing was quarried away over centuries for other buildings. The most interesting part is the hypogeum, the two-level network of tunnels, cages and lift shafts under the arena floor where animals and fighters were held before being raised into the ring.
Tickets are combined with the Roman Forum and Palatine Hill and are valid across consecutive days. Arena-floor and hypogeum access are separate upgrades with limited slots.