You go down a flight of steps near the pont de l’Alma and find yourself inside the Paris sewers. Not in a reconstruction: in a real stretch of the network, which goes on working while you walk through it, with the water running under the grating you are standing on.
It is one of the least touristy and most surprising visits in the city, the Musée des égouts de Paris costs 9 euros and it is included in the Paris Museum Pass. The conditions are what you would imagine: 13 degrees, little light, damp and possible smells, and the museum advises against it for anyone who suffers from claustrophobia, for pregnant women and for children under five. If you are sensitive to smells, I would not go straight after lunch.
One thing sets it apart from the other underground Paris: unlike the Catacombes, which have 131 steps and no lift, the sewer museum is wheelchair accessible.
How do you build a city on top of two thousand six hundred kilometres of tunnels?
Let’s go!
1. Two thousand six hundred kilometres, and you walk five hundred metres
The figure the museum gives is around 2,600 kilometres of tunnels. To give you the scale: that is the distance from Paris to Moscow, all of it under a city some ten kilometres across.
The visitor route crosses five hundred linear metres of it, and asks for 45 minutes to an hour and a quarter. Not many metres, but real ones: waste water, drinking water, telecommunications cables and compressed air pipes all run through these tunnels, and the city’s workers are in here every day.
2. The first covered sewer, in the fourteenth century
Before all this, where did the dirty water of Paris end up?
In the middle of the street, in open channels running down towards the Seine, which is where the city drank. The first covered masonry sewer arrived under the rue Montmartre in the 1370s, and it was built by the provost Hugues Aubriot, the same man who on 22 April 1370 had laid the first stone of the Bastille. The sources disagree on the date of the sewer: the SIAAP, the body that runs the network today, says 1370, others move it to 1374.
For centuries, though, it remained an exception. The network grew slowly and without a plan, and by the end of the eighteenth century nobody knew for certain where it ran.
3. Bruneseau, seven years in the dark
The figure who makes this museum a literary place is called Pierre-Emmanuel Bruneseau. Inspector of works for the city, between 1805 and 1812 he walked, mapped and had cleaned the whole medieval network. It took him seven years, in tunnels whose course nobody knew, and he came out of it with the first proper map of the Paris underground.
Victor Hugo told the story of that undertaking in Les Misérables, in the pages where Jean Valjean crosses the sewers carrying Marius on his back. Be careful, though, about what you are actually looking at: Jean Valjean’s flight is set in 1832, in the old network, while the tunnels you will walk are the ones Belgrand built twenty years later. The image comes from there; the place does not.
4. Belgrand, Haussmann and the network we know
The modern network dates from 1854, when the engineer Eugène Belgrand was given the job by Haussmann of building it along with the new boulevards. That is the point where the two Parises, the one above and the one below, were designed together: under every new street runs a collector. It is why in the tunnels you find plaques with the names of the streets over your head, and you find your way underground as you would on the surface.
The figures show how fast it went. In 1800 the network measured some twenty kilometres; in 1878, twenty-four years after Belgrand’s works began, it measured around six hundred. In one generation Paris built itself a second city under its own feet.
5. The visits began in 1867
How long have people been able to come down here out of curiosity?
The sewers have been visited for more than a century and a half, and the date is that of the Exposition Universelle of 1867. The Second Empire brought visitors down to show off the modernity of the capital, and the tour became one of the most sought after attractions: crowned heads came, ladies in search of a thrill and engineers on study missions.
The good part is how you visited. One stretch was done by boat, from the quai du Louvre to the Châtelet, and another aboard a small wagon-vanne, from the Châtelet to the Arts et Métiers. The machine used to clean the collector also served to carry the public around, and it is the same principle as the museum today: there is nothing to install, because it is enough to let people into the works.
6. The machines: the ball, the wagon and the boat
A collector silts up, and the sand the water carries settles on the bottom. The three machines on show are all there for that, and none of the three has an engine.
The boule de curage is a large sphere released into the pipe: the water cannot get round it, so it speeds up in the narrow gaps at the sides and scours the deposit away. The wagon-vanne does the same work in the secondary pipes, with a gate that dams the flow and then releases it all at once. The bateau-vanne is the large version, for the main collectors.
The chains and wheels you see are nineteenth-century objects, and they work on the force of the water that is already flowing.
7. The 2021 works, and how it is now
The museum reopened in 2021 after a complete overhaul. Everything around the tunnels changed: an entrance building on the riverside, with ticket desk and reception, a redesigned permanent route, passages opened where there were none and metal grating walkways in place of the old gangways.
The phrase the museum uses about the work is that visitors have been taken «from the shadows to the light», and the entrance was moved into a new building holding reception and the ticket desk. The photographs in circulation often predate the works, and show tunnels far darker than the ones you will find.
Warning: the overhaul made the route wheelchair accessible, with a lift. It is the difference that counts if you are choosing between this and the Catacombes, where you go down 131 steps and there is no lift at all.
Practical information
Details checked on 28 September 2026 on the official site musee-egouts.paris.fr. Prices and opening hours change: check again before you go.
Tickets. Full price costs 9 euros, the reduced rate 7 euros and goes to over-65s and to large families. Admission is free for under-18s, for citizens of the European Union under 26, for disabled visitors and their companion. The pass. The museum is included in the Paris Museum Pass. Nine euros is very little, so you do not buy the pass for this visit: if you already have it for the Orsay and the Invalides, which are round the corner, you go in without paying anything more. Opening hours. It opens Tuesday to Sunday, 10:00-17:00, and the last admission is at 16:00. Closing days. It closes on Mondays, on 1 May, on 25 December and for the first fortnight of January. Getting there. The entrance is in place Habib-Bourguiba, on the riverside near the pont de l’Alma. The stops are Alma-Marceau on line 9 and Pont de l’Alma on the RER C. What it asks of your body. You walk five hundred metres at 13 degrees, with little light, damp and possible smells. The museum advises against the visit for anyone who suffers from claustrophobia, for pregnant women and for children under five, and it is instead wheelchair accessible, with a lift, an induction loop for hearing aid users and assistance for visitors with impaired sight. How long it takes. The visit lasts from 45 minutes to an hour and a quarter.
Where to go from here
The other underground Paris you can visit is the Catacombes de Paris, twenty metres down under Denfert-Rochereau: the same tunnels cut in the same stone, but there you go down for the dead and here for the water, and there is no lift there. The museum that tells the story of the machines of nineteenth-century France is the Musée des Arts et Métiers, on the other side of the Seine. Round here, ten minutes on foot, are the Musée d’Orsay, the Musée de la Légion d’honneur, which is free, and the Musée de l’Armée.
Photo credits: tunnel and collector by Chatsam (CC BY-SA 3.0); boule de curage by filip (CC BY-SA 3.0); entrance pavilion by Chabe01 (CC BY-SA 4.0), from Wikimedia Commons.
