Did you know this? The Journées du Patrimoine are the cultural must-do of the season, arriving the weekend of September 19–20, 2026 across Europe. On the occasion, Paris and the entire Île-de-France region pull back the curtain on their treasures, with a programme thick of free tours, unconventional activities, and new-to-you venues that open their doors in an exceptional fashion. So, chasing a great plan to make the most of it?
Take a trip to the Hauts-de-Seine to discover this strange building, which has been standing in the middle ofIle Séguin in Boulogne-Billancourt since 2017. Conceived as a "musical destination",La Seine Musicale boasts an imposing 6,000-seat concert hall, "La Grande Seine", a 1,150-seat auditorium and various rehearsal and recording spaces.
Designed by architects Jean de Gastines and Shigeru Ban, the Seine Musicale is an architectural challenge, since the auditorium sits on the Seine and its wooden shell appears to float above the Parisian river. During the Heritage Days 2026, discover all the secrets of this venue that has quickly become a must-see cornerstone of the region's cultural life.
Listening walk at the Gauthier Mougin Departmental Park (in partnership with the Seine Musicale Open Doors)
Join a guide and two musicians for a thoughtful, sensory walk through the park.
Conceptualized by landscape architect Michel Desvigne, the park stems from an ambitious renaturation scheme for Île Seguin, following more than a century of industrial activity. Its winding route reveals fresh perspectives on the island, the river, and the surrounding territory.
The park also hosts a curated set of contemporary sculptures, forming a veritable open-air museum. This showcase is made possible thanks to support from the Hauts-de-Seine Department, the City of Boulogne-Billancourt, the Emerige Endowment Fund, the National Center for Decorative Arts (CNAP), and the Île-de-France Regional Fund for Contemporary Art (FRAC).
As you stroll, discover the landscape project and a selection of these works, accompanied by improvised music and sound pieces inspired by the landscape and the atmosphere of the site.
Meet at the park entrance, opposite the Tot'Aime sculpture by Jean-Charles de Castelbajac.
https://ileseguin-rivesdeseine.fr/fr
Participation conditions: Free. Note: meet beside the artwork "Toi t'aime" by Castelbajac, opposite the Seine Musicale - Free | No reservation required
Schedule: Saturday, September 19, 2026 – 11:00 to 12:30
Dates and Opening Time
On September 19, 2026
Location
La Seine Musicale
Île Seguin
92100 Boulogne Billancourt
Route planner
Accessibility info
Access
Metro line 9 Pont de Sèvres station (terminus). Exit 1 (take Quai Georges Gorse then Pont Renault) T2: Brimborion or Musée de Sèvres stations, then take the footbridge Bus: 160 - 169 - 171 - 179 - 279 - 291 - 389 - 429 - 467 Pont de Sèvres station
Prices
Free
More information
Free access, no reservation required
