Flavian Amphitheatre, Pozzuoli

The Flavian Amphitheatre of Pozzuoli, built in the second half of the 1st century AD under emperors Nero, Vespasian, and Titus, is the third-largest Roman amphitheatre ever constructed. It could accommodate up to 40,000 spectators across three tiers of seating. The underground areas, located 7 metres below ground, contained an elaborate system of gears and pulleys for raising animals and scenery to the arena, connected to the Phlegrean aqueduct for sophisticated water drainage. While medieval marble stripping damaged the exterior, the interior and subterranean chambers remain exceptionally well preserved.