Underground Sites in Rome

The table

Ten of the twenty are on a bookable tour. Where the last column reads none, the site is visited on your own ticket — that is not a gap in the research, it is how the tour industry clusters.

Catacombs of St. Callixtus

Ticket €10 / €7 · Time 40 minutes · Opening Closed Wednesday · On a tour St. Callixtus ticket, $16, Catacombs + crypt, $57, Appian golf cart, $108

The busiest of the Appian Way catacombs and the one most tours default to, holding the Crypt of the Popes where nine third-century popes were buried, and the crypt named for St Cecilia next door. The guided route lasts about forty minutes and tours leave every half hour, so a mid-morning arrival rarely means waiting — but check the day first, because Wednesday closes it completely.

Catacombs of San Sebastiano

Ticket €10 / €7 · Time About 40 minutes · Opening Closed Monday · On a tour Catacombs + crypt, $57, Appian golf cart, $108

A catacomb with its own basilica above it, associated by tradition with the sheltering of the relics of Peter and Paul. It runs the longest hours of any catacomb here, 09:15 to 17:15, which makes it the easy afternoon option — with two exceptions worth writing down: it closes on Mondays, and it shuts entirely from 7 to 27 December 2026.

Catacombs of Priscilla

Ticket €10 / €7 · Time 45 minutes to an hour · Opening Closed Monday · On a tour After hours, $74

Out on Via Salaria to the north, away from the Appian Way circuit, with over thirteen kilometres of galleries on two levels and some of the most studied early Christian painting anywhere. It is the quietest of the visitable catacombs by a wide margin — visitors regularly report having a guide to themselves — and the after-hours tour is the only one that goes there.

Catacombs of Domitilla

Ticket €10 + €2 booking / €7 · Time 45 minutes to an hour · Opening Closed Tuesday · On a tour English catacombs, $56, Catacombs + crypt, $57

The largest and oldest, dated from about 120 AD, running to roughly twenty kilometres of tunnels, and the only Roman catacomb holding a semi-underground basilica you can stand inside. Most catacomb visits are corridors; this one opens into a nave. It closes on Tuesdays, and the English-language tour is the one that enters it.

Catacombs of Sant'Agnese

Ticket Check at the door · Time About 40 minutes · Opening Closed Sunday, by arrangement · On a tour No tour here — your own ticket

The fifth catacomb open to the public, beneath the basilica of Sant'Agnese fuori le mura on Via Nomentana, run by the parish rather than through any ticketing platform. Hours are Monday to Saturday with Sunday by arrangement, and no tour compared here reaches it — which is exactly why it stays quiet.

Colosseum Hypogeum

Ticket Guided ticket, above standard admission · Time 90 minutes inside the monument · Opening Open every day · On a tour Underground + arena, $386, Arena or underground, $177, Colosseum 3-in-1, $93

The two-level service basement beneath the arena: the corridors that held animals and scenery, the shafts that lifted them, the staging area that made the spectacle work. It is reachable only on a guided ticket and sold separately from the arena floor, and it is the least atmospheric underground on this page — open to the sky in places and hot in August. How the tickets split.

Domus Aurea

Ticket €18, or €26 with guide and VR · Time 90 minutes · Opening Closed Monday to Friday · On a tour Domus Aurea VR, $81, Golden House, $99

Nero's palace, buried by Trajan's builders within forty years of his death and preserved by that burial — the frescoed vaults survived because they spent fifteen centuries underground. Renaissance painters lowered themselves through the ceilings to copy the decoration and, because the rooms felt like caves, coined the word grotesque. Weekends only, booking obligatory, hard hat issued at the door, about 90 percent humidity.

Case Romane del Celio

Ticket Separate small ticket · Time About 45 minutes · Opening Closed Check locally · On a tour No tour here — your own ticket

Around twenty rooms of Roman housing beneath the basilica of Santi Giovanni e Paolo on the Celio, with frescoes that track the shift from pagan to Christian imagery in a single building. A separate small ticket, self-guided, and reached by no tour on this page — a fifteen-minute walk from the Colosseum and almost always empty.

Stadium of Domitian

Ticket Separate small ticket · Time About 45 minutes · Opening Closed Check locally · On a tour No tour here — your own ticket

Piazza Navona keeps the exact shape of the stadium it was built on, and part of that stadium is visitable underneath. The section held by the École Française is private access only, which is what the expensive small-group walking tours are selling when they advertise exclusive access to Domitian's stadium.

Mamertine Prison

Ticket Separate ticket · Time 30 minutes · Opening Closed Check locally · On a tour No tour here — your own ticket

The holding cell beside the Forum that prisoners were lowered into through a hole in the floor, which is still there, later venerated as the cell where Peter and Paul were held. A separate ticket with a multimedia route, thirty minutes, and central enough to slot into any morning around the Forum.

Tomb of the Scipios

Ticket Small ticket, guided only · Time 45 minutes · Opening Closed Check locally · On a tour No tour here — your own ticket

The rock-cut family tomb of the Scipios at the start of the Appian Way, in use from the third century BC — Republican Rome rather than Christian, and older than every catacomb on this page. Visits are guided and booked with the city, which is why no commercial tour includes it.

Basilica di San Clemente

Ticket €10 / €5 · Time About an hour · Opening Open every day · On a tour No tour here — your own ticket

The best single demonstration of how Rome stacks: a 12th-century basilica over a 4th-century church over a 1st-century Roman street with an apartment block and a temple to Mithras, roughly sixty feet down, with running water audible at the lowest level. Two things to know — several ranking guides claim it can only be seen with a guide, and the basilica states plainly that it does not provide guided tours; what is obligatory is online booking, because daily admissions are capped.

Capuchin Crypt and Museum

Ticket €10 / €6.50 · Time 50 minutes to an hour · Opening Open every day · On a tour Crypts & catacombs, $69, Catacombs + crypt, $57, After hours, $74, Capuchin ticket, $25

Six chapels decorated with the bones of nearly four thousand friars, arranged as a memento mori rather than a curiosity, with a Caravaggio-attributed Saint Francis in the museum you pass through first. It is open every day of the week — one of only two central undergrounds that are — and it takes under an hour. Shoulders and knees must be covered, no photography, and no city pass of any kind is accepted.

Santa Cecilia in Trastevere Crypt

Ticket A couple of euros at the gift shop · Time 20 to 30 minutes · Opening Closed Check locally · On a tour No tour here — your own ticket

A crypt below the Trastevere basilica, reached down a narrow staircase and paid for at the gift shop for a couple of euros, holding fragments of the house identified as St Cecilia's beneath 19th-century neo-Cosmatesque decoration. Her body was moved here from St. Callixtus in the ninth century, which makes the two sites a pair worth doing in the same week.

San Nicola in Carcere

Ticket Small ticket at the door · Time 30 minutes · Opening Closed Check locally · On a tour No tour here — your own ticket

A church built into three Republican-era temples, their columns still visible from the street outside and their bases below the floor inside. It is among the cheapest underground visits in the centre and among the least visited, ten minutes from the Forum, and no tour compared here stops at it.

San Crisogono

Ticket Small ticket at the door · Time 20 to 30 minutes · Opening Closed Check locally · On a tour No tour here — your own ticket

A fifth-century early-Christian basilica underneath the later church in Trastevere, with 11th-century frescoes of Saint Benedict and Saint Sylvester, an earlier set of murals nobody has fully explained, a baptismal font and a sculpted Roman sarcophagus. Pair it with Santa Cecilia — the two are a ten-minute walk apart.

San Martino ai Monti

Ticket Included on some tours · Time 30 minutes · Opening Closed Check locally · On a tour Crypts & catacombs, $69

A third-century titulus beneath the basilica — a private house used for Christian worship before churches were legal — plus a hall of ancient architectural fragments and a fresco cycle of the early popes. It is the third stop on the Capuchin Crypts and catacombs tour, and the one thing that tour's after-hours version drops.

Vicus Caprarius, the City of Water

Ticket €4 / €2.50 · Time 30 minutes · Opening Closed Monday · On a tour Trevi express, $41, Trevi district, $51

Ten metres below the Trevi district, in the shell of the old Cinema Trevi, sits an imperial house and the castellum aquae of the Aqua Virgo — the tank that split the flow of an aqueduct commissioned in 19 BC and still feeding the fountain overhead. At €4 it is the cheapest archaeological site in central Rome and one of the very few where a Roma Pass buys anything.

Vatican Grottoes

Ticket Free with entry to St. Peter's · Time 30 to 45 minutes · Opening Open every day · On a tour St. Peter's, $38

The papal tombs directly beneath the floor of St. Peter's, along with surviving fabric of the fourth-century basilica Constantine built. They need no booking and no ticket beyond entry to the basilica, which is free — worth knowing, because tours advertising a St. Peter's underground visit usually mean these rather than the Necropolis below them.

Vatican Necropolis (Scavi)

Ticket Booked only through the Ufficio Scavi · Time About 90 minutes · Opening Closed Sunday · On a tour No tour here — your own ticket

A Roman street of the dead one level below the grottoes, buried when Constantine levelled the hillside, ending at the tomb identified as Peter's. Access runs only through the Ufficio Scavi of the Fabbrica di San Pietro — no platform, no operator, groups of about twelve, weeks of lead time in season. Visitors describe it as hot, humid and airless, not a refuge from a Roman summer.

The ten sites a tour reaches

Every tour name below links to its own page, where the full listing detail sits. Prices and ratings were read from the operator listings on 5 September 2026.

Why operators skip them

A €4 ticket at Vicus Caprarius or a couple of euros at Santa Cecilia leaves no margin for an operator. Parish-run sites like San Crisogono and San Nicola in Carcere have no group-booking system. The Vatican Necropolis admits about twelve people at a time through its own office and cannot be resold by anyone. San Clemente caps daily admissions and does not provide guides at all.

None of that makes them lesser visits. San Clemente is the single best demonstration of Rome's stratigraphy and it is on no tour on this page.

An afternoon on your own tickets

Four of them are easy, cheap and central enough to string together — and they make a better afternoon than a second catacomb would.

• San Clemente — €10, open every day, online booking obligatory
• Vicus Caprarius — €4, closed Mondays, thirty minutes, book at weekends by WhatsApp
• San Nicola in Carcere — a small ticket, three Republican temples under one church
• Santa Cecilia in Trastevere — a couple of euros at the gift shop
• Total for all four: about €25, against one guided catacomb tour