Naples Underground: Which Entrance Is Which?
One of the most common mistakes visitors make in Naples is booking a “Naples Underground” tour and arriving somewhere completely different from the place they pictured. The name is shared by several separate sites, each with its own entrance, ticket and character. This guide sorts them out — and if you would rather skip straight to the options, our Naples Underground tours page compares every one.
Why there is more than one
Naples has been quarried and tunnelled for well over two thousand years. Greeks cut building stone from the soft tuff, Romans turned the cavities into an aqueduct, and later generations added cellars, shelters and passages. The result is not a single attraction but a whole underworld, and different operators open different parts of it under the same broad label. The four you will actually see advertised are these:
- Napoli Sotterranea — the classic aqueduct route, entered near Piazza San Gaetano.
- The Spanish-Quarters underground — the same tuff-and-aqueduct world, entered at Vico S. Anna di Palazzo.
- Neapolis Sotterrata — the excavated Roman streets beneath San Lorenzo Maggiore.
- The Bourbon Tunnel — a separate 19th-century passage on Via Domenico Morelli.
Did you know? The famous underground network sits roughly 40 metres below the streets, reached by about 121 steps — there is no lift on the aqueduct routes, which is why footing and stairs matter more than any other single factor.
Napoli Sotterranea (Piazza San Gaetano)
This is the site most people mean by “Naples Underground.” You descend the 121 steps to follow the Greek-Roman aqueduct and its cisterns, cross a narrow passage often lit by candlelight, and finish with a genuine surprise: a buried Roman theatre reached through an ordinary building above ground. If you want the classic experience, our skip-the-line ticket is the most direct way in. For the full step-by-step, see what to expect on a Naples Underground tour.
The Spanish-Quarters underground (Vico S. Anna di Palazzo)
A short walk away, a different operator opens the same world from the Quartieri Spagnoli. It is the most-reviewed underground tour in the city and a compact, well-guided hour below the streets — a strong first choice, and the one many families pick. You can book it directly as the Spanish Quarters guided tour.
Neapolis Sotterrata (San Lorenzo Maggiore)
Beneath San Lorenzo Maggiore lie the excavated streets and market of ancient Neapolis — Roman shopfronts and pavements rather than water tunnels, only about ten metres down. Many historic-centre walks include it; if “underground Roman ruins” is what appeals, the walking tour with the underground Roman ruins is the one to look at.
The Bourbon Tunnel (Galleria Borbonica)
Different again is the Bourbon Tunnel, a nineteenth-century passage built for the royal family and later used as a wartime shelter and a vehicle pound. It is the one underground site in the city with meaningful step-free access. We compare the two head to head in Naples Underground vs the Bourbon Tunnel, and step-free details are on our accessibility guide.
Useful tip. Look at the meeting-point address on your ticket, not the tour name. Piazza San Gaetano and Vico S. Anna di Palazzo are the aqueduct; San Lorenzo Maggiore is the Roman ruins; Via Domenico Morelli is the Bourbon Tunnel.
What it is not
It is worth stating plainly: none of these are the Catacombs of San Gennaro. The catacombs are an early-Christian burial site on the Capodimonte hill, and they are not part of the underground aqueduct network. If burial galleries and frescoes are what you want, that is a different visit entirely.
Which should you choose?
For most first-time visitors, the aqueduct route — either Napoli Sotterranea or the Spanish Quarters entrance — is the fullest experience, taking in the cisterns, the narrow passage and the Roman theatre. Prefer to walk through Roman streets than descend deep cisterns? Choose the Neapolis Sotterrata. Need step-free access? Start with the Bourbon Tunnel. And if you simply want to see as much as possible, remember these are different places: doing two of them is entirely reasonable. Before you book, it is worth a look at our visiting hours and tickets page, since each entrance keeps its own timetable and English departures are limited.
Did you know? Only a fraction of the network is open to visitors — the tunnels run for kilometres beneath the historic centre, and much of what you can walk today was cleared of a century of rubble only in recent decades.
Getting between the sites
The good news for anyone torn between entrances is that the main sites sit close together in the historic centre. Napoli Sotterranea near Piazza San Gaetano, the Spanish-Quarters entrance at Vico S. Anna di Palazzo and the Neapolis Sotterrata under San Lorenzo Maggiore are all within a comfortable walk of one another. The Bourbon Tunnel is a little further, over towards Chiaia on Via Domenico Morelli, but still an easy stroll or a short metro hop. Nothing here needs a taxi or a day of planning; the whole underground world is packed into a small, walkable quarter, and you can sort the logistics on our visiting guide.
Timing and booking across the sites
Each entrance keeps its own timetable, and the single most important variable is language. On the aqueduct tours, Italian departures are frequent while English ones are limited — often just a couple of slots a day — so if you need an English guide, decide that first and book around it. In high season, and for the popular midday slots when the cool underground is most appealing, spaces go quickly. Booking ahead also lets you compare what each tour actually includes rather than choosing on the door in a hurry, and it protects you from arriving to find the only English departure already full.
What each site does best
Put simply: the aqueduct tours are the most atmospheric, with the cisterns, the candlelit passage and the buried theatre; the Neapolis Sotterrata is the most archaeological, letting you walk Roman streets at close range; and the Bourbon Tunnel is the most surprising, with its wartime shelters and abandoned vehicles. If you only have time for one and want the classic experience, choose the aqueduct — the top-rated Spanish Quarters tour is a reliable first booking. If accessibility decides it, the Bourbon Tunnel is your starting point, as our accessibility guide explains.
A suggested combination
If you have a spare half-day and a taste for the underground, pair one aqueduct tour with one contrasting site. Start with the aqueduct — the skip-the-line ticket is the quickest way in — then add either the Neapolis Sotterrata for its Roman streets or the Bourbon Tunnel for its nineteenth-century engineering. Two very different sites in a day gives you the full range of what lies beneath Naples without repeating yourself, and each takes only about an hour below ground. There is no wrong choice among the aqueduct entrances; the distinctions matter most when choosing between the aqueduct, the Roman ruins and the Bourbon Tunnel.
The bottom line
“Naples Underground” is a category, not a single door. Match the entrance address to the experience you want, read the tour’s inclusions, and you will avoid the single most common disappointment in the city’s most rewarding attraction. When you are ready, you can compare every Naples Underground tour and ticket in one place, or check the FAQs for the quick answers.