Plan your visit to Mamertine Prison
The Mamertine Prison (Carcere Mamertino) is Rome's only surviving ancient prison, two underground chambers carved from natural rock beneath the church of San Giuseppe dei Falegnami at the foot of Capitoline Hill. The visit takes 30 to 45 minutes and feels very different from the surrounding monumental sites: dark, intimate, and stripped of spectacle. Most come for the ancient Roman history, the Christian tradition linking the site to Saints Peter and Paul, or both. This guide covers opening hours, tickets, how to get there, and what to expect once inside.
Mamertine Prison at a glance
- When to visit: Daily, 9am to 5pm. Last entry at 4pm. Closed 25 December and 1 January.
- Getting in: Standard entry from €10, digital audio guide included. Combo tickets with the Colosseum, Roman Forum, and Palatine Hill from €34. Walk-up entry is possible; online booking is recommended June through September when the surrounding Forum area is at its busiest.
- How long to allow: 30 to 45 minutes for most visitors. No guided tours; the included audio guide is the primary interpretive option and extends the visit toward the upper end.
- When to go: Weekday mornings, particularly Mondays and Thursdays, are noticeably calmer. June through September brings the highest visitor numbers to the Roman Forum area.
- What most people miss: The lower Tullianum chamber, where prisoners were held before execution, sits beneath the upper room via a narrow staircase. Most visitors linger above and rush the Tullianum. Allow at least 10 minutes in the lower chamber.
Jump to what you need
Where and when to go
Which ticket is right for you?
| Ticket type | What's included | Best for | Price |
|---|---|---|---|
Standard entry | Access to both chambers, digital audio guide via app (Italian, English, French, German, Spanish, Portuguese) | A standalone visit to Mamertine without the Colosseum or Forum on the same day | From €10 |
Combo: Mamertine + Colosseum + Roman Forum + Palatine Hill | Entry to all four sites, timed Colosseum entry | Spending a full day across the Roman ruins and avoiding four separate ticket purchases | From €34 |
Altare della Patria + Colosseum + Palatine + Forum + Mamertine | Entry to all five sites | Combining Mamertine with the Altare della Patria terrace for the broadest possible Roman day | From €55 |
How do you get around Mamertine Prison?
Mamertine Prison is small enough to cover in a single loop. From the entrance on Clivo Argentario, visitors descend into the upper chamber (Carcer) first; the lower chamber (Tullianum) is accessed through a narrow staircase at the rear of the Carcer. The entire navigable area can be crossed in under two minutes, but both chambers reward slower attention.
What should you prioritise at Mamertine Prison?
The Tullianum
The oldest part of the prison is the lower chamber, carved directly into the Capitoline rock. Originally accessed only through a hole in the ceiling — prisoners were lowered by rope — today a narrow modern staircase leads down. The circular domed space is low, dark, and genuinely ancient. Notable prisoners including Jugurtha (king of Numidia, starved to death here in 104 BC) and Vercingetorix (held for six years before Julius Caesar's triumph in 46 BC) were kept here before execution. A spring in the floor is associated by tradition with Saint Peter's miraculous baptism of guards and fellow prisoners.
- Era: 7th century BC
- Where to find it: Narrow staircase at the rear of the upper chamber.
The Carcer
The upper level served as Rome's primary detention facility and underwent substantial alterations over the centuries, including a travertine facade during the early Imperial period. An altar with an inverted cross, referencing the tradition that Saint Peter was crucified upside-down, is the focal point of the room. Plaques on the walls list historical prisoners associated with the site.
- Era: 4th to 6th century BC
- Where to find it: Entered directly from the ticketing desk at ground level.
The Church of San Giuseppe dei Falegnami
The church sits above the prison on Capitoline Hill, dedicated to Saint Joseph the Carpenter. Access is separate from the prison ticket and entry to the church is free. It provides useful historical context for the site: a Renaissance church built over a Roman dungeon, itself built over a structure from the 7th century BC.
- Era: 16th century
- Access: Separate from prison ticket; free to enter.
Facilities and accessibility
Rules and restrictions
Practical tips
- Download the audio guide app before you leave your accommodation. Search for the Carcere Mamertino app in your phone's app store. Mobile signal inside the underground chambers is too weak to load it on arrival, and the visit without the audio guide is largely unlabeled stone.
- Visit Mamertine Prison as part of a Roman Forum day rather than as a standalone journey. The Forum entrance is a 2-minute walk; the prison makes a natural start before the Forum or a quiet close at the end, rather than a separate trip.
- Entry is in 30-minute slots. Arriving early in your slot gives you time in the Tullianum before the next group. The lower chamber is small enough that six to eight people at once makes it feel full.
- If you are booking the Colosseum on the same day, book that timed entry first. Colosseum slots fill faster than Mamertine; arrange Mamertine around whatever Colosseum window is available.
- The €10 standard ticket includes the audio guide. There is no cheaper option to enter without it, and the guide is what makes the two chambers legible. It is not an optional extra.
What else is worth visiting nearby?
Eat, shop and stay near Mamertine Prison
Frequently asked questions about visiting Mamertine Prison
Most visitors spend 30 to 45 minutes. The audio guide extends the visit toward the upper end. The site consists of two chambers and covers a small footprint, so there is a natural limit to the visit duration even for those with a deep interest in the history.
Walk-up entry is available. Advance booking is not strictly required, but is recommended between June and September, particularly on weekend mornings when the surrounding Forum area is at its busiest. January through March and weekday mornings throughout the year are reliably straightforward for same-day purchase at the door.
No. Mamertine Prison is a separate site with its own ticketing. It is not included in the standard Colosseum ticket or the Forum Pass SUPER. A combined ticket (Mamertine + Colosseum + Forum + Palatine Hill) is available from €34.
Arrive 5 to 10 minutes before your slot time. The entrance process is straightforward, but the 30-minute slot begins at the stated time. [VERIFY: confirm slot system is currently enforced]
Personal photography is permitted throughout. Professional photography equipment (tripods, detachable lenses) is not permitted. [VERIFY specific policy]
No. The lower chamber (Tullianum) requires descending a narrow staircase and is not accessible to wheelchair users. The upper chamber (Carcer) may be partially accessible; confirm directly with the site before visiting. [VERIFY]
Children under 5 enter free. The site works well for children aged 8 and above with an interest in Roman or Christian history. The underground atmosphere and historical content around executions can be unsettling for younger children. The visit is short enough that attention spans are less of a factor than at larger sites.
No food or drink is available on-site. The nearest practical option is the Piazza Venezia area, a 5-minute walk north.
At Clivo Argentario, 1, 00186 Roma, at the foot of Capitoline Hill, directly adjacent to the northern edge of the Roman Forum. Take Metro Line B to Colosseo station, then walk 10 to 12 minutes northwest.
No. The Mamertine Prison has not functioned as a prison since late antiquity. It became a Christian pilgrimage site in the early centuries AD and is now a historical monument open to visitors.
It depends on your interest. For visitors with a genuine interest in ancient Roman history, early Christian history, or both, the site offers a compelling and atmospheric 30 to 45 minutes unlike anything at the larger monuments nearby. For visitors primarily motivated by archaeological scale or visual spectacle, the small site and €10 entry may feel like poor value compared to the Forum or Colosseum. The audio guide is essential; the two chambers without it are largely unlabeled stone.
