The Colosseum Underground - officially called the hypogeum - is the subterranean network of corridors, cages, lift shafts, and ramps that sat directly beneath the arena floor and made the spectacles above it possible. It was never a space the public saw during the games; it was the operational backstage, hidden by design so that animals, gladiators, and entire stage sets could appear from the arena floor without warning. Access today is not included in standard Colosseum entry and requires a dedicated ticket with a mandatory guided tour - daily capacity is strictly limited and slots sell out weeks in advance. Prices and availability referenced on this page are as of 2025 and are subject to change; for current options see underground ticket options.
What the Colosseum Underground Is — and Why It Was Built
The hypogeum takes its name from the Greek for "under the earth." Emperor Vespasian commissioned the Colosseum in 72 AD and his son Titus inaugurated it in 80 AD, but the underground level was not part of the original build. It was added approximately a decade later under Emperor Domitian, Titus's younger brother, and it fundamentally changed what the arena could do. Before the hypogeum existed, large animals and stage equipment had to be brought in through the arena-level entrances - visible to the crowd, which broke the theatrical illusion the games depended on. The hypogeum solved that problem. With 15 corridors, an original count of 28 lifts that expanded to more than 60 by the 2nd century AD, and a central ramp running the full length of the structure, the underground allowed animals, fighters, and full set pieces to appear from the arena floor as if from nowhere. The audience seated across five tiers never saw the hundreds of workers, slaves, and animals staged below them. For a more complete picture of the levels above ground, see what's inside the Colosseum.
What You'll See Inside the Colosseum Underground
The underground is explored as a structured route with multiple stops - your guide determines the sequence and pace, and free-roaming is not permitted. The following are the main spaces and features you will encounter along that route.
The Corridor Grid and Square Arches
The hypogeum is organized as a grid of 15 corridors running beneath the full footprint of the arena. The corridors are lined with square arches - a construction detail worth noting because most surviving Roman arch examples are rounded. These keystones have remained intact for approximately 1,900 years. Standing inside the corridors, you look up through the large central open area toward the underside of the reconstructed arena floor above, which gives an immediate sense of the vertical distance between where the work happened and where the spectators watched. For more on the arena floor itself and what survives today, see the arena floor history and what remains.
The Animal Holding Niches
Cut into the corridor walls at regular intervals are niches that served as cages for the animals used in the games - lions, tigers, bears, and other exotic species imported from across the Roman Empire. The physical scale of the niches is one of the more striking details at ground level: they are tight, enclosed spaces designed for containment, not movement. Animals were held here until the lift mechanisms brought them to the surface. From the suspended walkway installed above the corridor grid, you can look down and trace the positions of the niches across the full layout.
The Lift Mechanisms and the 2015 Replica
The lifts are the most mechanically significant feature of the hypogeum. The original count was 28; by the 2nd century AD that number had grown to at least 60, reflecting successive phases of expansion and refinement - figures vary by source. Each lift was hand-operated via a winch system and raised its load - an animal, a fighter, a prop, or a combination - through a trapdoor cut into the arena floor above, timed to create a sudden appearance in front of the crowd. In 2015, a German architect built a full-scale working replica of one of the original lifts, and it is now installed in-situ in the underground. Visitors can see the shaft structures, the remaining traces of the original mechanisms alongside the replica, and - in the reconstructed sections of the arena floor above - some of the trapdoor positions that the lifts fed into.
The Central Ramp
Running the full length of the underground along its central axis was a large ramp used to move heavy stage sets and scenery to the surface. This was not a simple incline - it operated on a tilting mechanism capable of raising full set pieces including trees, rock formations, and constructed environments used in the staged animal hunts. This is the infrastructure behind what spectators experienced as a fully dressed theatrical stage rather than an empty sand floor. The ramp's position along the central axis meant it could serve the full width of the arena above it.
The Gladiator Entry Corridor
A dedicated tunnel connected the hypogeum directly to the Ludus Magnus - the gladiator barracks and training ground located across what is now a modern road. Gladiators walked from their quarters through this tunnel into the underground without appearing above ground at any point before the arena. The passage is no longer accessible - a modern road and sewer system block the route - but the original doorway arch where the corridor entered the hypogeum is still visible from inside the underground. For context on how guides interpret this and the Ludus Magnus connection during a visit, see small-group guided tours.
The Underground Drainage Stream
A stream running beneath the hypogeum remains connected to the original Roman drainage system and is visible to visitors along the route. A venue built for 50,000 people required active water management below the structure, and the drainage system was engineered into the original design rather than added later. The stream is a minor stop on the route but a direct illustration of how the Romans integrated water management into the structure from the original build.
The Suspended Walkway
The suspended walkway was installed as part of the 2021 restoration that reopened the underground permanently to the public. It runs above the corridor grid and allows visitors to look down across the full layout simultaneously - corridor positions, elevator shafts, animal niche locations, and technical rooms are all visible from a single vantage point. For most visitors, this is the moment the scale and organization of the hypogeum becomes clear. From corridor level, you see individual features in isolation; from the walkway, you see how they connected into a coordinated system.
Is the Colosseum Underground Worth the Ticket?
The underground adds genuine content that the standard ticket does not cover - the lift mechanisms, the corridor grid, the gladiator entry point, and the walkway vantage point are all inaccessible without it. Whether that content justifies the additional cost and planning effort depends on who is visiting.
Worth it if: this is your first visit to the Colosseum and you want a complete picture of how the games actually worked; you have any interest in Roman engineering or construction; you want access to areas the majority of visitors on any given day will not see. The underground answers questions that the standard interior levels raise but cannot answer - where did the animals come from, how did the stage sets appear, what was below the floor.
Can reasonably skip if: you are visiting with very young children - the corridors are tight, dimly lit, and the guided format moves at a pace that does not suit short attention spans; your time in Rome is limited and a mandatory guided tour of at least 90 minutes for the underground portion alone does not fit your schedule; you have visited the Colosseum before and already saw down into the underground from the arena floor, which provides a partial view of the corridor layout without descending into it.
One practical constraint shapes the decision more than preference: underground tickets release 30 days in advance via the official site and sell out fast - often within hours of release during peak season. For many visitors, availability makes the choice rather than interest. Note also that underground access and attic access cannot be combined in the same ticket on the same day; if the attic is also on your list, those require two separate visits. For the combined underground and arena floor ticket specifically, see the underground and arena floor combo ticket.
Tickets That Include Underground Access: The Two Official Options
Standard Colosseum entry does not include the underground under any circumstances. Two official ticket types grant access as of 2025, both requiring a guided tour and both sold exclusively through the official Colosseum Archaeological Park site. Third-party operators including GetYourGuide, Tiqets, and Viator offer underground packages when official inventory is available - cancellation policies and inclusions vary by vendor. For a full comparison of where to buy, see where to buy Colosseum tickets.
| Ticket | What's Included | Guided Duration | Notes |
|---|---|---|---|
| Full Experience (Underground + Arena) | Underground, Arena Floor, tiers 1-2, exhibitions, Roman Forum, Palatine Hill, Imperial Fora; valid 2 days | ~3 hours | 30-day booking window; sells out fast; best availability early morning |
| Evening Underground Tour | Underground, arena, first tier, permanent exhibition; Roman Forum + Palatine Hill for daytime tours only (tours after 6 PM: above-ground Forum overview instead) | ~60 min underground | Official site only; not available on-site |
Both ticket types require a guided tour - self-guided underground access is not permitted. All prices and inclusions are subject to change; confirm current details on the official booking page before purchasing.
The underground is one of the most capacity-restricted areas in the Colosseum. If the official site shows no availability within your travel window, third-party operators maintain separate allocations and are worth checking before ruling it out. For the full breakdown of ticket options across all access levels, see underground ticket options.
If the underground is on your list, the ticket decision is the step that determines whether you get in at all - access is guided-only, capacity is fixed, and the 30-day window moves fast.