Monumental oval amphitheatre in the centre of Rome, Italy, constructed of travertine limestone and concrete. It stands as the largest ancient amphitheatre ever built and an enduring symbol of imperial Roman engineering. Key Metric: Completed 80 AD under Emperor Titus; capacity of 50,000–80,000 spectators; UNESCO World Heritage

Contender: The Colosseum
Contender: The Colosseum
Monumental oval amphitheatre in the centre of Rome, Italy, constructed of travertine limestone and concrete. It stands as the largest ancient amphitheatre ever built and an enduring symbol of imperial Roman engineering.
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