History of the Paris Catacombs
Why there are several million people under the 14th arrondissement, who put them there, and what changed in the two hundred and forty years since. Dates below come from the Ville de Paris; the Paris Catacombs Tours guided walks cover the same ground with someone to ask.
Fourteenth century: the limestone that built Paris
The tunnels came first, and they were never meant to hold anyone. From the fourteenth century quarrymen cut Lutetian limestone out of the ground south of the city walls, and the stone went into the buildings above. Paris grew over its own quarry, gallery by gallery, without much record of where the voids were.
By the eighteenth century that was a problem. Streets subsided into workings nobody had mapped, and the crown created an inspectorate to find the tunnels and hold them up.
1780: the Saints-Innocents cemetery closes
The Saints-Innocents had taken the dead of central Paris for roughly ten centuries. It was full, it was above the water table, and the neighbouring cellars had begun to give way under the weight of what was buried next door. In 1780 the authorities closed it.
That created a second problem: the remains had to go somewhere, and there was no ground left inside the city to put them in.
7 April 1786: the Paris Municipal Ossuary is consecrated
The answer was underneath. A section of disused quarry beneath the Plaine de Montsouris was prepared, blessed and consecrated as the Paris Municipal Ossuary on 7 April 1786. The transfers began the following year, moving at night, in covered carts, with a priest walking ahead.
1785 to 1860: seventy-five years of transfers
The evacuations were not one event. They ran in bursts across three regimes, pausing for revolution and resuming when the city needed the ground again.
| Period | What happened |
|---|---|
| 1785–1787 | First evacuations, emptying the Saints-Innocents |
| 1787–1814 | Transfers continue from other parish grounds, through the Revolution |
| 1840 | Transfers begin again after a long pause |
| 1859–1860 | A final round as Haussmann’s rebuilding clears more ground |
The stone plaques you pass on the route are the record of that work: each one names the cemetery the bones behind it came from, and the month they arrived.
Charles-Axel Guillaumot, the man who stopped Paris falling in
Guillaumot was an inspector at the Department of General Quarry Inspection, and the site was handed to him. His first job was structural — surveying the voids, building the piers and cross-walls that keep the streets above from dropping into them. The ossuary was work he took on top of that.
What survives of his engineering is still holding up part of the 14th arrondissement. The consolidation piers on the visitor route are his.
1809: the first visitors, by appointment
From 1809 the Catacombs were opened to the public, a few at a time and only by arrangement. A visitor that year left a line still quoted in the site’s own displays: they had visited the true temple of equality. The appeal was never only morbid.
1810–1814: Héricart de Thury arranges the bones
Inspector Louis-Étienne Héricart de Thury took over and turned a store into a monument. Between 1810–1814 he had the bones restacked into the walls you see now — courses of femurs faced with skulls, crosses and hearts worked into the surface, inscriptions cut into stone tablets along the way.
Almost everything a visitor photographs today is his composition rather than an accident of storage. The audio guide introduced in 2026 is narrated in his voice for exactly that reason.
Who is actually down there
The transfers emptied more than a dozen parish grounds, so the ossuary holds Parisians from every station of the old city — and, inevitably, some names anyone would recognise. Nobody can be pointed to. The bones were moved cemetery by cemetery, not person by person, and once they were stacked into a wall the individual was gone.
That is why the plaques name a graveyard and a date rather than a person, and why the site describes several million anonymous people rather than a list. The figure most often quoted elsewhere is around six million.
The twentieth century, and one address
The quarries kept being useful. During the Second World War different parts of the network sheltered different people, and the Catacombs entrance now carries the name of Colonel Henri Rol-Tanguy, who commanded the Paris Resistance from a bunker in the quarry system during the liberation of the city in 1944.
November 2025 to 8 April 2026: the renovation
The most recent chapter is the freshest thing about the place. The site closed in November 2025 for technical works and reopened on 8 April 2026. Air-handling units were replaced, continuous temperature, humidity and CO&sub2; monitoring went in, the lighting was completely redesigned, and the Wall of the September Martyrs was rebuilt using dry-stone walling. A new route and a new audio guide arrived at the same time.
If you visited before 2026, you have not seen the current site.
Two centuries of this, in ninety minutes
A guide fills in what the plaques leave out — who was moved, from where, and why the walls look the way they do.
The monuments themselves are catalogued on the galleries and monuments page, and the stories that grew around the quarries — including the one about the doorkeeper — are on legends and cataphiles. For hours and prices, see the visiting guide.