Built between AD 70-72, the Colosseum is still the largest amphitheatre in the world nearly 2,000 years later. Here, over four levels reaching 157ft high (47.85m), 50,000 Ancient Romans would cheer on gladiators, who often fought to the death. The remains of the hypogeum, where gladiators and wild animals waited before coming up into the arena to fight, can be seen clearly from viewing points. Despite damage from earthquakes, fire and lightning over the years, the Colosseum remains truly monumental, and a must-see on any visit to Rome. Score: 6.78
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