Visiting the Capucins quarry beneath Cochin Hospital in Paris

The carrière des Capucins, located beneath Cochin Hospital in Paris's 14th arrondissement, is one of the city's least-known underground sites. Located in former limestone quarries nearly 18 meters (59 ft) below ground, it is usually closed to the public and only opens occasionally for special tours.

I explored it on a guided tour, and the experience made a lasting impression on me.

In this article, I share its history, what you can see in its underground passages, and how you can legally visit the Capucins quarry today.

Carrière des Capucins: a hidden world beneath Cochin Hospital

Beneath Cochin Hospital, the carrière des Capucins extends for just over one kilometer (about 0.6 miles), completely cut off from other underground passages in Paris.

A limestone labyrinth in the heart of the 14th arrondissement

The carrière des Capucins is located beneath today's Cochin Hospital, between Boulevard de Port-Royal and Rue du Faubourg-Saint-Jacques, in southern Paris.

It lies about 18 meters below the surface (about 59 ft), in near-total silence that is hard to imagine, especially considering how lively the neighborhood is above ground. The network stretches over a little more than one kilometer of galleries (about 0.6 miles), and is relatively compact compared with the vast network beneath Paris, but it is exceptionally rich in history.

What makes this quarry unusual is that it is completely separate from the rest of the Paris quarry network. It is not connected to the catacombs or to the better-known tunnels explored by cataphiles. This isolation has helped keep the site remarkably well preserved.

During my visit, I was struck by how well preserved and orderly the site felt, far from the graffiti, trash, or makeshift constructions that you sometimes come across in other parts of the underground.

Limestone extraction from the Middle Ages to the 18th century

The carrière des Capucins was mainly quarried between the 12th and 18th centuries. Much of Paris was built using limestone quarried beneath the city, brought up piece by piece and hauled to the surface using ingenious lifting systems. The blocks taken from here were used in buildings across the capital, helping shape the Paris we know today.

To transport the stone, quarrymen used extraction wells equipped with wooden wheels and a winch system. Using this system, a single man could haul up blocks that weighed close to a ton. It was grueling work, carried out in damp, dusty conditions and near-constant darkness, with the sound of stone being cut echoing through the quarry.

Over the centuries, the easiest-to-reach layers of limestone were gradually depleted and, in 1813, two decrees brought underground quarrying in the area to an end.

From quarry to hospital: how the quarry helped shape Cochin Hospital

In the 18th century, the neighborhood around what is now Cochin Hospital was a poor, working-class area, inhabited largely by quarry workers. Quarry accidents were frequent: collapses, falls into wells, injuries from hauling heavy stone blocks.

In response, Abbé Cochin bought several nearby houses to accommodate injured quarrymen. That initiative, born directly from the constraints of underground work, eventually led to the creation of Cochin Hospital.

During the visit, I found this link between the quarry below and the city above particularly striking: the galleries supplied the city with stone, and the dangers of quarrying indirectly helped give rise to a major Paris hospital.

What to see during a visit to the Capucins quarry?

A visit to the Capucins quarry takes you into a world of its own, somewhere between industrial heritage, geological curiosities, and small details that seem frozen in time.

The 119-step descent underground

The tour begins with a 119-step staircase that descends from inside Cochin Hospital. Step after step, the air becomes cooler and more humid, natural light disappears, and the sounds of the hospital give way to a muffled silence. The gradual descent gives you time to adjust to the atmosphere below.

When you reach the bottom, you enter the first chamber where you find the Capucins fountain, one of the most surprising features of the quarry. The light-colored stone, the murmur of the water, and the discreet lighting create an atmosphere that feels almost timeless.

The "fountain" of the Capucins: a water-monitoring feature, not a drinking fountain

Despite its name, the Capucins fountain was not designed to provide drinking water, but to monitor the water-table level. On the back wall, a water level gauge allows the water level to be read precisely, much like a vertical measuring scale. The structure is listed as a historic monument, reflecting the importance of this system for underground safety.

The water there is strikingly clear, with an almost unreal transparency in the soft light of the lamps. During my visit, I was surprised by the attention paid to its design: carefully built vaults, stone benches, niches. The space was designed in part to impress visiting officials with a setting that was both functional and elegant.

Baptisms were even held there: the small niche carved into the limestone bench to the left in the photo once housed a statue of the Virgin.

Galleries, drawings in bone black, and an optical illusion

The visit continues through a succession of galleries with warm lighting. The rough walls are dotted with marks, inscriptions, and drawings made with bone black, a black pigment made by heating bones in the absence of oxygen. This material, darker and more durable than ordinary lampblack, holds up extremely well over time: several of these markings are still clearly visible today.

You also come across an unusual sculpture, presented to visitors as a curiosity: the face is carved as a concave relief into the stone, but appears convex when viewed from the right angle. It creates a striking optical illusion. When I walked up to it, I instinctively stepped back to get a better look, the illusion was so convincing.

The extraction shafts: an "inverted vertigo"

Further on, you come to one of the former limestone extraction shafts. It is a large vertical cylinder, whose full height becomes clear when you look up toward the quarry ceiling. At the time, this shaft was used to haul the stone blocks back up to the surface, thanks to winch mechanisms.

In front of this shaft, I thought of this quote by Philippe Geluck: "Caving is mountaineering for people who are afraid of heights." It creates a kind of inverted vertigo: instead of looking into the emptiness beneath your feet, you look up into a deep vertical void overhead.

It is hard to imagine that, twenty meters higher (about 65 ft), people are casually walking along the sidewalk, near an ordinary air vent, unaware of the void beneath them.

Plaques, topography, and reinforcing the Parisian "Swiss cheese"

Another striking feature is the number of location plaques fixed along the galleries. They indicate your exact position relative to the streets above, mention former streets or landmarks, and help you navigate this underground maze.

The plaques also preserve traces of how street names changed over time: on one of my photos, you can make out a plaque marked "rue de la Bourbe." This street no longer exists under that name today. It was first renamed "rue de Port-Royal" before being integrated into the current boulevard de Port-Royal. Underground, the old street names remain almost frozen on the walls, preserving a record of an older Paris.

The Capucins quarry also stores many old Parisian street signs. Some bear names that no longer appear on current maps, others have been replaced by new versions. Some include notes or numbers that hint at their history.

Walking through these galleries, you almost feel as if you were wandering through a small hidden museum of Parisian signage, nothing like a conventional museum above ground. I spent a long time reading these signs, trying to picture which intersection or building facade they had once been attached to.

The quarry ceiling is sometimes reinforced by large pillars made of stacked limestone blocks. These pillars were added as engineers became more aware of the instability of the ground beneath Paris.

At the end of the 18th century, the city of Paris established an inspection service for the quarries, responsible for mapping the galleries and stabilizing the maze of quarries beneath the city. Many workers from the neighborhood, already familiar with stonework, were hired to build these massive pillars, like the ones you can see in the first photo of the article, designed to reinforce the Capucins quarry.

A staircase turned into a mineralogy collection

One of the final highlights of the tour is a staircase turned into a small mineralogy display. On its steps and on the walls, you can see the different layers of rock identified between the quarry and the surface. It is both an educational tool and a good example of how the geology beneath Paris can be explained visually.

When I emerged back outside after the tour, I was left with the feeling that I had experienced an unusual and memorable outing beneath the streets of Paris. It is the kind of visit that stays with you because it is rare, little known, and closely tied to the history of the neighborhood.

Visiting the Capucins quarry today: access, practical information, and tips

There are no regular opening hours or permanent ticket office for the Capucins quarry: visits are only possible during occasional special openings, generally supervised by associations.

How can you visit the Capucins quarry today?

The Capucins quarry is normally closed to the public to protect this fragile underground heritage. Access remains tightly controlled, and information about upcoming tours is currently difficult to obtain.

Historically, the quarry was monitored and preserved by SEADACC (Société d'Études et d'Aménagement des Anciennes Carrières des Capucins – Society for the Study and Development of the Former Capucins Quarries), an association responsible for its preservation, research, and public outreach. It occasionally organized small group tours, sometimes in partnership with other scientific and heritage organizations such as ArkéoTopia.

As of this update, the SEADACC website is no longer accessible and current access arrangements are unclear. However, I have not found any public notice confirming that the association has been dissolved. You can try contacting SEADACC at association@seadacc.com, but I cannot guarantee that this address is still monitored.

When tours were offered in the past, they were generally organized during one-off events (Heritage Days, AP-HP – Paris public hospital authority – open days, educational or scientific programs). If you would like to visit the Capucins quarry, your best option is to monitor announcements about Paris underground heritage and cultural events that may include rare public access to the site.

Where is the entrance and how do you get there?

The entrance to the Capucins quarry is located inside Cochin Hospital, in the 14th arrondissement of Paris. When a tour is organized, the exact meeting point is shared with participants, but it is always somewhere within the hospital complex along Boulevard de Port-Royal.

To get there by public transport, you have several convenient public transportation options:

• Metro line 6: Saint-Jacques station, then a short walk to Cochin Hospital.
• RER B: Port-Royal station, a short walk from the hospital entrances.
• Bus: several lines serve Boulevard de Port-Royal and the Observatoire neighborhood (lines 59, 91, 83, among others), useful if you are coming from elsewhere on the Left Bank.

On the day of your tour, I would suggest allowing a little extra time to find the entrance, check in at hospital reception if required, and reach the meeting point indicated by the organizers.

Practical information: temperature, fitness level, and equipment

The route through the Capucins quarry is not technically difficult for someone with normal mobility, but it is still a subterranean tour with a few practical things to keep in mind.

• Temperature: underground, the temperature stays around 13°C (about 55°F) all year. Even in the middle of summer, you will want to bring a warm layer (sweater or light fleece) so you do not feel cold during the visit.
• Staircase: access is via 119 steps, which of course you have to climb back up at the end. The pace is reasonable, but it can be tiring if you have difficulty with stairs.
• Shoes: I would recommend that you wear comfortable, stable closed-toe shoes with good grip (like sneakers). The ground can be slightly damp or uneven in places.
• Light: the installed lighting is sufficient to move around safely, but if you enjoy looking closely at details (inscriptions, stone textures, carvings), a headlamp or a small flashlight is helpful.

During my visit, I found the route easy to navigate, with no narrow passages. The main requirements are being comfortable underground and able to manage the staircase down and back up.

Capucins quarry or official catacombs: which to choose?

If you are trying to choose between visiting the Capucins quarry (when possible) and visiting the Paris Catacombs that are open to the public, they offer two very different but complementary experiences.

If you have the opportunity to do both, you will get a broad overview of the role the underground has played in Paris's history: one tells the story of the stone that built the city; the other, of the bones that tell its human story.

The traveler's memo for visiting the Capucins quarry in Paris

Here are the answers to the most common questions about visiting the Capucins quarry, beneath today's Cochin Hospital in Paris.

The Capucins quarry, a rare glimpse beneath everyday Paris

Descending into the Capucins quarry reveals a different side of Paris, quiet, stone-lined, and far removed from the bustle above. Between the Capucins fountain, the reinforced tunnels, the old street plaques, and the mineralogical staircase, the visit offers a tangible look at the history of the stone that built the city.

It is also a good example of little-known heritage, preserved for decades thanks to the work of enthusiasts and associations committed to studying the Paris underground. Because access is so rare, visiting requires patience, but that is also part of what makes the experience special. If you are curious about what lies beneath Paris and have the chance to join one of these tours, I would absolutely recommend it: it is the kind of experience that stays with you long after the visit.