The Flavian Amphitheater in Pozzuoli, Italy, is a massive Roman amphitheater that ranks as the third-largest in the country, after the Colosseum and the Amphitheatre of Capua. Built during the reign of Emperor Vespasian and completed under his son Titus, this elliptical structure can hold up to 50,000 spectators. Visitors can still see parts of the gears used to lift cages onto the arena floor. The site was chosen at a crossroads from Naples, Capua, and Cumae, but was later partially buried by volcanic eruptions. Despite being stripped of its exterior marble during the Middle Ages, the interior remains remarkably well-preserved, making it a fascinating destination for history buffs and architecture enthusiasts alike.