Set off to discover Paris's little-known sewer museum during Heritage Days.

The Paris Sewer Museum is taking part in the 43rd edition of Heritage Days. Mark your calendars for Saturday, September 19 and Sunday, September 20, 2026, for offbeat tours into the underground of Paris.

And what if you went underground to celebrate the 43rd edition of the Journées du Patrimoine?

Each year, this cultural event invites countless curious people to push open the doors of fascinating cultural venues, major institutions, castles, or even places usually closed to the public. The Journées du Patrimoine are also an opportunity to explore museums and enjoy unconventional and offbeat tours.

That’s exactly what awaits you on Saturday, September 19 and Sunday, September 20, 2026 at the Paris Sewer Museum. Often overlooked by the general public, this underground museum is well worth a visit...

Heritage Days 2026: Paris museums and art foundations across Île-de-France
During the 2026 Heritage Days, numerous museums and art foundations open their doors for free in Paris and the Île-de-France region. Mark your calendars for Saturday, 19 September and Sunday, 20 September 2026 to enjoy a program rich with exciting discoveries. [Read more]

Set off to discover Paris's little-known sewer museum during Heritage Days.
The Paris Sewer Museum is taking part in the 43rd edition of Heritage Days. Mark your calendars for Saturday, September 19 and Sunday, September 20, 2026, for offbeat tours into the underground of Paris. [Read more]

Heritage Days thus give us the chance to learn more about this immersive museum located underground. It is here that we discover the essential cleaning and maintenance work carried out in the sewers. The museum also explains the challenges of water regulation and treatment, in service of protecting the environment and the river, while visitors walk above functioning sewers.

It's an opportunity to gain a better understanding of the major challenges facing Parisian sanitation from yesterday to tomorrow, through an unusual visit featuring a museographic tour, models, interactive educational activities and multimedia.

Heritage Days 2026 program at the Paris Sewer Museum:

Tour of the Sewer Museum
For European Heritage Days 2026, the Sewer Museum invites visitors to freely explore all of its facilities. Discover or rediscover the city beneath the city—a unique, enigmatic, and educational museum that anchors its 150-year history while embracing modernity, with a fully renovated building now visible from the Seine.
Participation terms: Free | No reservations required
Hours: Saturday, September 19, 2026 — 10:00 AM to 5:00 PM | Sunday, September 20, 2026 — 10:00 AM to 5:00 PM

So, are you ready to plunge into the history of Paris's sewers?