The Flavian Amphitheatre (Anfiteatro Flavio) in Naples is the world’s third largest ancient Roman arena.
The Amphitheatre is not far from Naples
In the historic heart of Pozzuoli, just a short distance from the bustling city of Naples, this magnificent arena is a marvel of Roman engineering and culture. Recognized as the third largest arena of the ancient Roman world, after the Colosseum in Rome and the amphitheater in Capua, this ancient structure offers a glimpse into the grandeur of antiquity. 
By road, train and boat to the Flavian Amphitheatre
Reaching the Flavian Amphitheatre is both convenient and scenic. From Naples it is about ten miles to Pozzuoli by car or on the Cumana train line to Pozzuoli Solfatara station, and the amphitheater is just a short walk from the station. Another option to consider, for those with more time om their hands, is to take a ferry from Naples to Pozzuoli, combining the visit with stunning views of the Bay of Naples.
Underground chambers and a small chapel
The Anfiteatro Flavio isn’t just a shell of its former self, today it is a place where history breathes. Built in the 1st century A.D. to replace a smaller Republican-era amphitheater, the arena was designed to host a massive audience, catering to the Roman appetite for grand spectacles. The key highlights include the Underground Chambers which are among the best-preserved in the world and house a system of pulleys and elevators that transported animals, gladiators, and equipment to the arena floor. The Prison of St. Januarius Chapel was built in the 17th century to commemorate the imprisonment of Naples patron saint, San Gennaro. 
Guided tours and audio guides
The Arena is where gladiators once battled each other and wild animals, and the arena floor and seating areas evoke a visceral sense of the spectacles that drew thousands in ancient times. Guided tours are available, many led by passionate guides who bring the site’s history to life. Audio guides are also an option for independent explorers, while advanced bookings for group visits are recommended, especially during the peak tourist season.
