The Catacombs of Paris: Underneath the city of light lies a chamber of darkness and death

Meet the family: some of the residents of the Paris catacombs. Image: AFP/Getty.

In the ground beneath Paris, hundreds of miles of tunnels run like arteries. Underneath the streets lie spaces of all kinds: canals and reservoirs, prisons, crypts and bank vaults, wine cellars transformed into nightclubs and galleries. None are as creepy as the infamous Catacombs.

At a depth of 20 metres, equivalent to the size of a five storey building, the catacombs lie deeper than the Metro and sewer systems. These 200 miles of old caves, quarries and tunnels are full to bursting with the bones of deceased Parisians from centuries past. The history of the Catacombs is one of gory necessity: the story of a city which could no longer contain its dead.

The catacombs have existed since the13th century, when the mining of limestone quarries to provide bricks for the city’s buildings created as a side effect an entire underground city: the carrières de Paris, an intricate web of tunnels, lying mostly under the southern part of the metropolis.


Parisians had taken material from the ground to build upwards – but later they found that they needed to reuse the spaces they'd created below. By the 18th century, the cemeteries had started overflowing.

In Les Halles, near Paris' biggest cemetery, Les Innocents, the stench was unbearable. Perfume stores complained that they couldn't do business: the air was so thick with the smell of rotten flesh that no scent could penetrate the odour. In 1763, Louis XV banned any further burials inside the capital, but the Church didn't want cemeteries disturbed or moved, and so nothing else was done.

Then, in 1780, there was a prolonged period of spring rain. That May, the weight of damp ground full of bodies caused the wall of a restaurant cellar in the Rue de la Lingerie to collapse. Rotting bodies and old bones flooded the property; outbreaks of disease followed.

Some of the tunnels. Image: AFP/Getty.

At the same time, by (un)happy coincidence, the walls of the local quarries were beginning to cave in. The solution to both problems seemed obvious. In 1786, the city authorities began to empty the cemeteries, and move human remains to the abandoned quarry tunnels.

It took the residents of several cemeteries to fill each catacomb. In order not to disturb the locals, the bodies were transferred in the dead of night, hidden under dark cloth on the back of carts. As they passed through the darkened streets, priests would chant for the morbid cargo.  By the end of the process, over 6m late Parisians had been moved to the as the ossuaries, their bones covering the walls from head to toe.

During the Revolution, the dead were buried directly in the catacombs. The new arrivals in this period included both Jean-Paul Marat and Maximilien de Robespierre. But after 1860, as other facilities became available, no fresh bodies were added to the tunnels.

The catacombs of Paris are not unique: in medieval Europe, it was quite common to dig up bones and store them in charnel houses and ossuaries, in order to make space in cemeteries for more corpses.

You can find such piles of bones in the Wamba ossuary in northern Spain's Church of Santa Maria, Valladolid, or the ossuary of St Leonard's in the Kent town of Hythe. In the 16th century Cappela dos Ossos, in the Portuguese town of Evora, near Lisbon, 5,000 individuals, thought to be war and plague victims, are embedded decoratively into the chapel walls.

Some of the catacombs' older residents. Image: DJTox/Wikimedia Commons.

The tunnels beneath Paris have had other uses, too. The quarries were mined up until the 18th century, and used by farmers to grow mushrooms after that. During World War II, French Resistance fighters used some as hide-outs; the Germans built bunkers in others.

Nowadays there are groups that like to explore the passages under Paris their own way. These “cataphiles” are mostly young rebellious folk, undeterred by the fact that is has been illegal to enter the Catacombs without official guidance since 1955. They spend their time exploring, attracted by the idea of being underground both literally and metaphorically


Until the late 1980's it was possible to enter the tunnels from a number of points, including some doorways in schools and other buildings. Today, though, many are closed off, and the cataphiles have to be more cunning, both when gaining access (this often involves ropes) and when avoiding the police unit who patrol the passageways. It isn’t a hobby for those with claustrophobia or a nervous disposition.

Today just over a mile of these meandering tunnels are open to the public. The entrance is located in Paris' 14th arrondissement, at 1 Avenue du Colonel Henri Rol-Tanguy. Paying visitors walk under a doorway, with a haunting inscription above it: "Arrête, c'est ici l'empire de la mort!" (“Stop! This is the empire of death!”) Never have truer words been spoken.

 
 
 
 

Urgently needed: Timely, more detailed standardized data on US evictions

Graffiti asking for rent forgiveness is seen on a wall on La Brea Ave amid the Covid-19 pandemic in Los Angeles, California. (Valerie Macon/AFP via Getty Images)

Last week the Eviction Lab, a team of eviction and housing policy researchers at Princeton University, released a new dashboard that provides timely, city-level US eviction data for use in monitoring eviction spikes and other trends as Covid restrictions ease. 

In 2018, Eviction Lab released the first national database of evictions in the US. The nationwide data are granular, going down to the level of a few city blocks in some places, but lagged by several years, so their use is more geared toward understanding the scope of the problem across the US, rather than making timely decisions to help city residents now. 

Eviction Lab’s new Eviction Tracking System, however, provides weekly updates on evictions by city and compares them to baseline data from past years. The researchers hope that the timeliness of this new data will allow for quicker action in the event that the US begins to see a wave of evictions once Covid eviction moratoriums are phased out.

But, due to a lack of standardization in eviction filings across the US, the Eviction Tracking System is currently available for only 11 cities, leaving many more places facing a high risk of eviction spikes out of the loop.

Each city included in the Eviction Tracking System shows rolling weekly and monthly eviction filing counts. A percent change is calculated by comparing current eviction filings to baseline eviction filings for a quick look at whether a city might be experiencing an uptick.

Timely US eviction data for a handful of cities is now available from the Eviction Lab. (Courtesy Eviction Lab)

The tracking system also provides a more detailed report on each city’s Covid eviction moratorium efforts and more granular geographic and demographic information on the city’s evictions.

Click to the above image to see a city-level eviction map, in this case for Pittsburgh. (Courtesy Eviction Lab)

As part of their Covid Resource, the Eviction Lab together with Columbia Law School professor Emily Benfer also compiled a scorecard for each US state that ranks Covid-related tenant protection measures. A total of 15 of the 50 US states plus Washington DC received a score of zero because those states provided little if any protections.

CityMetric talked with Peter Hepburn, an assistant professor at Rutgers who just finished a two-year postdoc at the Eviction Lab, and Jeff Reichman, principal at the data science research firm January Advisors, about the struggles involved in collecting and analysing eviction data across the US.

Perhaps the most notable hurdle both researchers addressed is that there’s no standardized reporting of evictions across jurisdictions. Most evictions are reported to county-level governments, however what “reporting” means differs among and even within each county. 

In Texas, evictions go through the Justice of the Peace Courts. In Virginia they’re processed by General District Courts. Judges in Milwaukee are sealing more eviction case documents that come through their courtroom. In Austin, Pittsburgh and Richmond, eviction addresses aren’t available online but ZIP codes are. In Denver you have to pay about $7 to access a single eviction filing. In Alabama*, it’s $10 per eviction filing. 

Once the filings are acquired, the next barrier is normalizing them. While some jurisdictions share reporting systems, many have different fields and formats. Some are digital, but many are images of text or handwritten documents that require optical character recognition programs and natural language processors in order to translate them into data. That, or the filings would have to be processed by hand. 

“There's not enough interns in the world to do that work,” says Hepburn.


Aggregating data from all of these sources and normalizing them requires knowledge of the nuances in each jurisdiction. “It would be nice if, for every region, we were looking for the exact same things,” says Reichman. “Instead, depending on the vendor that they use, and depending on how the data is made available, it's a puzzle for each one.”

In December of 2019, US Senators Michael Bennet of Colorado and Rob Portman of Ohio introduced a bill that would set up state and local grants aimed at reducing low-income evictions. Included in the bill is a measure to enhance data collection. Hepburn is hopeful that the bill could one day mean an easier job for those trying to analyse eviction data.

That said, Hepburn and Reichman caution against the public release of granular eviction data. 

“In a lot of cases, what this gets used for is for tenant screening services,” says Hepburn. “There are companies that go and collect these data and make them available to landlords to try to check and see if their potential tenants have been previously evicted, or even just filed against for eviction, without any sort of judgement.”

According to research by Eviction Lab principal Matthew Desmond and Tracey Shollenberger, who is now vice president of science at Harvard’s Center for Policing Equity, residents who have been evicted or even just filed against for eviction often have a much harder time finding equal-quality housing in the future. That coupled with evidence that evictions affect minority populations at disproportionate rates can lead to widening racial and economic gaps in neighborhoods.

While opening up raw data on evictions to the public would not be the best option, making timely, granular data available to researchers and government officials can improve the system’s ability to respond to potential eviction crises.

Data on current and historical evictions can help city officials spot trends in who is getting evicted and who is doing the evicting. It can help inform new housing policy and reform old housing policies that may put more vulnerable citizens at undue risk.

Hepburn says that the Eviction Lab is currently working, in part with the ACLU, on research that shows the extent to which Black renters are disproportionately affected by the eviction crisis.

More broadly, says Hepburn, better data can help provide some oversight for a system which is largely unregulated.

“It's the Wild West, right? There's no right to representation. Defendants have no right to counsel. They're on their own here,” says Hepburn. “I mean, this is people losing their homes, and they're being processed in bulk very quickly by the system that has very little oversight, and that we know very little about.”

A 2018 report by the Philadelphia Mayor’s Taskforce on Eviction Prevention and Response found that of Philadelphia’s 22,500 eviction cases in 2016, tenants had legal representation in only 9% of them.

Included in Hepburn’s eviction data wishlist is an additional ask, something that is rarely included in any of the filings that the Eviction Lab and January Advisors have been poring over for years. He wants to know the relationship between money owed and monthly rent.

“At the individual level, if you were found to owe $1,500, was that on an apartment that's $1,500 a month? Or was it an apartment that's $500 a month? Because that makes a big difference in the story you're telling about the nature of the crisis, right? If you're letting somebody get three months behind that's different than evicting them immediately once they fall behind,” Hepburn says.

Now that the Eviction Tracking System has been out for a week, Hepburn says one of the next steps is to start reaching out to state and local governments to see if they can garner interest in the project. While he’s not ready to name any names just yet, he says that they’re already involved in talks with some interested parties.

*Correction: This story initially misidentified a jurisdiction that charges $10 to access an eviction filing. It is the state of Alabama, not the city of Atlanta. Also, at the time of publication, Peter Hepburn was an assistant professor at Rutgers, not an associate professor.

Alexandra Kanik is a data reporter at CityMetric.