Under place Denfert-Rochereau, twenty metres down, there is a kilometre and a half of galleries in which the bones of several generations of Parisians are stacked into walls that reach the ceiling. It is not a crypt and it is not a cemetery: it is an emptied stone quarry, into which the city moved its own dead at the end of the eighteenth century because there was no longer room for them on the surface.
Before you plan it, a few figures that change the shape of the day. The ticket costs 31 euros, audio guide included, and booking online is in practice compulsory, because each time slot admits only a few people. Then there are the stairs: 131 steps down and 112 to climb at the end. The route is not wheelchair accessible, the museum advises against it for anyone who suffers from claustrophobia, and down there it is 14 degrees all year round, July included.
And there is one thing almost no guide has updated: the Catacombes reopened on 8 April 2026, after five months of works, and what you will read elsewhere often describes the old arrangement.
How does a stone quarry end up as the largest ossuary in the world?
Let’s go!
1. The stone that built Paris, and the void it left behind
Paris is built out of the stone that lies beneath it. The Lutetian limestone of the beds under the left bank is the stone of the Marais mansions, of the churches and of the quais, and it was quarried on the spot: in open pits from the first century, underground from the fourteenth.
The galleries you will walk through are the old quarries of the Tombe-Issoire, under the plain of Montrouge, worked from at least the fifteenth century and then abandoned. They are a small fraction of a labyrinth that runs under the city for around eight hundred hectares. Keep that in mind as you go: you are not visiting a monument that was built, but an absence, the negative of the buildings you see on the surface.
2. 1774, when a street fell in
Why did the monarchy concern itself with what lay under the city?
Because in the middle of the eighteenth century the ground of Paris began to give way. In 1774 a serious collapse in what is now rue Denfert-Rochereau, then called rue d’Enfer, took down three hundred metres of street, and it was the last of a series. The response came in two stages: on 15 September 1776 Louis XVI banned for good any extraction of materials under the public highway, and on 4 April 1777 he created the Inspection générale des carrières, the service charged with watching over the disused quarries and shoring them up.
The man who directed the work was Charles-Axel Guillaumot, and he is the one who would also be told to lay out the site and organise the transfer of the bones. The masonry pillars you see holding up the ceiling at several points along the route are his trade: they were built to stop the city collapsing, not to receive visitors.
You can still read his name in the galleries, on the founding plaque. It says the Catacombes were established in 1786 by order of the lieutenant general of police Thiroux de Crosne and under the direction of Charles-Axel Guillaumot, and that they were restored and enlarged by Héricart de Thury in 1810.
3. The cemetery that could take no more
The cimetière des Saints-Innocents, the largest in Paris, stood in the middle of town, where the fountain and the square of the Innocents are today, and since the Middle Ages it had received the dead of twenty-two parishes. The problem was not only the smell. Century after century the common graves had raised the ground two and a half metres above street level, and on 7 May 1780 the cellar wall of a house in rue de la Lingerie gave way under that pressure: bones and bodies slid into the basement. The Parlement of Paris ordered the cemetery closed on 4 September of the same year.
The answer was the quarry. The clearing began on 9 November 1785 and went on for fifteen months, at night, with covered carts and processions of priests. With the work still under way, on 7 April 1786, the galleries of the Tombe-Issoire were blessed and consecrated as the municipal ossuary under the name «Catacombes»; the transfers from the other parish cemeteries of the city carried on from 1787 to 1814, and the last deposits arrived in 1860, with Haussmann’s demolitions.
As you walk, read the plaques set into the bones: they say which cemetery each stretch of wall comes from and in what year it arrived. One of them declares that the bones of the old cemetery of the Madeleine, in rue de la Ville-l’Évêque, were deposited in 1844 in the west ossuary and brought here in September 1859.
That cemetery is not just any cemetery, and the plaque is worth the twenty seconds it asks for. During the Revolution the Madeleine was deliberately kept open to receive those executed on place de la Révolution, today’s place de la Concorde. Louis XVI and Marie Antoinette were buried there too, and the queen had left for the scaffold from the Conciergerie, on 16 October 1793. The remains of the two sovereigns were exhumed during the Restoration and taken to Saint-Denis; everything else from that cemetery ended up here.
4. The fort carved by a quarryman
Before the ossuary, on the way, comes the most moving thing of the whole visit, and it has nothing to do with death. A quarryman by the name of Décure, who had been a soldier, spent his free time between 1777 and 1782 carving into the rock a scale model of the fort of Port-Mahon, the fortress on Minorca where he had been a prisoner of the English.
What happened next is told by the Inspection générale des carrières. While he was digging an access that would let him reach his work more easily from the level above, the ceiling collapsed, and Décure died shortly afterwards of his injuries. The relief stayed where it was, and you walk right past it.
5. «Arrête! C’est ici l’empire de la mort»
On the lintel of the door that opens into the ossuary is the most photographed sentence in underground Paris: Arrête! C’est ici l’empire de la mort. Stop: here begins the empire of the dead.
The panel does not tell you this, and it is worth knowing. That sentence was not invented for the occasion: it is an alexandrine from the translation of the Aeneid that Jacques Delille published in 1804, and in the sixth book it is spoken by Charon as he receives Aeneas on the bank of the Styx. The attribution comes from Paris Musées, which runs the site.
Whoever chose that inscription knew what they were doing. It announces a river you have to cross, and on the other side it puts the afterlife of the classics instead of the hell of the preachers.
6. The walls designed by an engineer
At the start, the bones were simply piled up anyhow. What you see today is a deliberate arrangement, made between 1810 and 1814 by the inspector Héricart de Thury, who reshaped the ossuary along museographic and monumental lines before it opened to the public.
The principle comes from the quarrymen. The walls are built on the model of the hagues, the heaps in which quarry waste was stowed: the facing alternates rows of femurs and tibias with rows of skulls, and behind that facing everything else is packed in, often broken into fragments by the fall. What looks like macabre decoration is a storage problem solved well.
Héricart de Thury added masonry monuments in the antique and Egyptian taste, in the form of Doric pillars, altars, cippi and tombs, and he gave the places names taken from religious and Romantic literature: the sarcophagus of the Lacrymatoire, the fountain of the Samaritaine, the sepulchral lamp. As you walk, look at the tablets with quotations set among the bones: they are part of the same design, and they come from Virgil, from the Bible and from the poets of the eighteenth century.
7. How many are there? The city does not say
How many people are down here?
The honest answer is that nobody knows exactly, and the owner of the site publishes no figure. I looked for it on every page of the Ville de Paris, and it is not there: they speak of «several million Parisians», and they repeat it in the instructions they give you before the visit, where they ask you not to touch the bones because these are the fragile remains of millions of people.
The six million you will find in almost every guide is an estimate, and it stays an estimate however many people repeat it. It could hardly be anything else: the bones come from dozens of different cemeteries, over seventy years of transfers, and nobody counted them on arrival.
8. What changed on 8 April 2026
The Catacombes closed in the autumn of 2025 and reopened on 8 April 2026, after five months of work. The works covered the conservation of the remains, safety, air quality and the lighting of the galleries, which in a very damp underground space are all connected problems.
The photograph at the top of this page is from July 2026, after the works: the points of light you can see on the ground along both sides of the corridor are the new spotlights, sunk into the floor. In the older images in circulation, including the one of the threshold of the ossuary, which is from 2010, the galleries are lit by the old hanging bulbs.
Two things change for you. The first is the new lighting design, meant to show details that used to stay in the dark. The second is the rewritten audio guide, with actors playing historical and fictional characters, and it is included in the price of the ticket.
At the beginning of the route, from 29 September 2026 to 31 January 2027, there is also an exhibition that fits this place better than it would fit anywhere else: Nadar: inventer Paris, des profondeurs au ciel. Nadar patented electric light for photography in 1861 and the following year brought it down here, when the Catacombes were open to very few. What is on at the moment, here and at the other venues in the city, I keep up to date in the table of exhibitions in Paris.
Warning: online you will find descriptions of an immersive headset included in the ticket. On the site of the operator it does not exist: the prices page says «audio guide included», and the reopening announcement speaks of an audio guide, not a headset. If you turn up expecting virtual reality, you will be disappointed by whoever wrote that, not by the Catacombes.
Practical information
Details checked on 28 September 2026 on the official site catacombes.paris.fr. Prices and opening hours change: check again before you go.
Tickets. Full price costs 31 euros and includes the audio guide. The reduced rate costs 25 euros and goes to anyone between 18 and 26, to students and to teachers. From 8 to 17 years old you pay 15 euros, and under 8 admission is free, without the audio guide. Anyone entitled to free admission goes in without booking, showing proof at the desk, and can buy the audio guide separately for 5 euros. Booking. Booking online is effectively compulsory and opens seven days ahead: each time slot admits a fixed number of people. I suggest the first slot of the morning, because the route runs one way and is narrow, and with few people ahead of you you walk at your own pace. Warning: the Catacombes are not included in the Paris Museum Pass, and they are the exception to the rule that the city museums of Paris have free permanent collections. The other exception, the Crypte archéologique on the Île de la Cité, is closed today. Thirty-one euros is a high price even for Paris, and it helps to have something to compare it with: the Louvre asks 22 euros of anyone resident in the European Economic Area and 32 of everybody else, the Panthéon between 13 and 16 euros depending on the season, and the sewer museum 9. Opening hours. The site opens Tuesday to Sunday, 9:45-20:30, and the last admission is at 19:30. It closes on Mondays, on 1 January, 1 May and 25 December. Getting there. The address is 1 avenue du Colonel Henri Rol-Tanguy, on place Denfert-Rochereau. You get there on metro lines 4 and 6 and on the RER B, all at the Denfert-Rochereau stop. What it asks of your body. You go down 131 steps and climb back up 112, you walk a kilometre and a half one way twenty metres underground, and the temperature is a steady 14 degrees: bring a sweatshirt even in August. The route is not wheelchair accessible and is not advised for anyone with mobility problems, for anyone who suffers from claustrophobia or for anyone with heart or breathing conditions. How long it takes. The museum gives one hour as the average, and listening to the whole audio guide takes you to an hour and a quarter.
Where to go from here
On the other side of the same square, in Ledoux’s twin pavilion, is the Musée de la Libération, which is free and which keeps, twenty metres underground, the command post from which the Resistance directed the insurrection of 1944: two very different undergrounds a hundred metres apart. The other underground Paris you can visit is that of the Paris Sewer Museum, which unlike the Catacombes is wheelchair accessible and costs a third as much. Since 2002 the Catacombes have come under the Musée Carnavalet, which tells the story of Paris above ground and whose permanent collection is free. And if you are lining up the masterpieces of the city museum by museum, the considered list is in artworks to see in Paris.
Photo credits: corridor of the ossuary and wall of skulls by Matthias Süßen (CC BY-SA 4.0); threshold of the ossuary by Julian Fong (CC BY-SA 2.0); founding plaque by Jean-David & Anne-Laure (CC BY-SA 2.0), from Wikimedia Commons.
