Underground Naples (Napoli Sotterranea) is a fascinating network of tunnels, caverns, and ancient passageways located beneath the streets of Naples, Italy, primarily in the historic city centre. Dating back to Greek and Roman times, these subterranean spaces were originally used as aqueducts, quarries, and shelters, and later served various purposes including bomb shelters during World War II. Visitors can explore the labyrinth of chambers, arches, and tunnels, seeing ancient stonework, frescoes, and even remnants of early Christian sites. The experience offers a unique perspective on Naples’ layered history, combining archaeology, architecture, and urban legend.

Visiting Underground Naples requires a guided tour, as access is controlled for safety reasons. Tours generally run daily, with multiple time slots from morning to late afternoon, though schedules may vary by season or special events. Tickets are priced per adult, child, or student, and advance booking is recommended, especially in high tourist season. Because the tours involve walking through narrow, uneven tunnels, visitors should wear comfortable shoes and casual clothing, and bring a light jacket since temperatures underground are cooler than on the surface. Photography may be allowed in certain areas, but flash use is often restricted to protect the site.

Most visitors spend 1–1.5 hours exploring the underground network, guided by knowledgeable staff who explain the history, legends, and engineering behind the tunnels. Tours are especially atmospheric in the morning or early evening, when lighting highlights the textures of the ancient stonework. Underground Naples is easily combined with visits to the historic centre, Piazza del Gesù, Spaccanapoli, and other nearby cultural landmarks, making it an unforgettable stop for history enthusiasts and curious travellers alike.