The complex includes a 'Garden of the Future,' where plants are grown in total darkness using hydroponic techniques to test subterranean farming potential.
The tunnels housed the city's main water supply system, the Serino Aqueduct, which functioned until the 19th century.
A portion of the underground tour includes a visit to the remnants of a Roman-era theater where Emperor Nero allegedly performed.
During the Allied bombings of World War II, an estimated 200,000 Neapolitans took refuge in these tunnels.
The temperature in the underground chambers remains constant at approximately 18°C (64°F) year-round.
Underground Naples is a network of tunnels and cisterns located 40 meters beneath the historic center of Naples. The site comprises ancient Greek-Roman cisterns, WWII air-raid shelters, and remains of a Roman theater. Excavations began in the 4th century BCE when Greeks quarried tuff rock to build the city walls and temples. These cavities later served as the city's primary water supply system for centuries. During World War II, the tunnels were repurposed as shelters, retaining original artifacts like cots, toys, and stoves. Visitors traverse narrow passages illuminated by candlelight, passing through areas of the ancient aqueduct. The path leads through underground chambers that reveal layers of architectural history ranging from the Roman era to modern usage. The site operates as a dedicated educational museum managed by the Napoli Sotterranea association.
The wide, vaulted water cistern chamber illuminated by provided candles.
Bring a light jacket as the underground temperature is significantly cooler than the surface, even in summer.
Wear comfortable, non-slip rubber-soled shoes as the floor surfaces can be uneven and occasionally damp.
If you are prone to claustrophobia, inform your guide, as some sections involve very narrow, low-ceilinged passageways.
Do not confuse this specific site with other 'Napoli Sotterranea' branded tours in the city; ensure you arrive at the Piazza San Gaetano location.
Stick close to your guide at all times; do not venture into blocked-off areas.
