On September 20 and 21, 2025, culture will be back in the spotlight with the Journées du Patrimoine! The most important cultural event of the year is back, with a heavy dose ofactivities,workshops and guided tours at some of Europe's most beautiful historic addresses. Throughout theÎle-de-France region, the Journées du Patrimoine bring together a myriad of sites open to the public free of charge to delve into the region's fascinating history. Explore sumptuous châteaux, discover charming unspoilt villages, or visit emblematic museums and monuments, all of which offer their share of surprises. Let yourself be swept away by this cultural adventure, a true celebration of the rich heritage of Île-de-France!
Take advantage of the Journées du Patrimoine 2025 to get out of the capital and explore the vast regions of Ile-de-France, such as the charming commune of Conflans-Sainte-Honorine, in the Yvelines department. Founded in the 12th century, the town has prospered over the years thanks to its strategic location on the banks of the Seine. The authentic charm of its cobbled streets takes us back to medieval times, while its impressive castles and churches bear witness to its rich heritage today. In the 19th century, Conflans-Sainte-Honorine became an essential river crossroads, bustling with commerce and traditional "bateaux-mouches". Today, Conflans-Sainte-Honorine continues to attract visitors with its picturesque charm and its many points of interest, which can be explored on foot or on the water.
Heritage Days 2025: the musée de la batellerie program in Conflans-Sainte-Honorine (78)
They're back: on the weekend of Saturday September 20 and Sunday September 21, 2025, the Journées du Patrimoine (Heritage Days) kick off their new edition in Paris and the Île-de-France region. In Conflans (78), visit the Musée de la Batellerie et des voies navigables with a special program! [Read more]
> Heritage Days 2025 at Château de Themericourt
The Château de Théméricourt, home to the Ecole Régionale du Premier Degré (ERPD), will once again be opening its doors. Visitors will discover the boarding school for the sons of boatmen, created in 1924 by its owner, Albert Morillon.
> Heritage Days 2025 at Château du Prieuré - Winter Garden
Come and discover the local cultural heritage with the unique know-how of Conflan artists and craftsmen.
> Heritage Days 2025 at the Grand Cellier du Prieuré
Exceptional opening of the large 13th-century cellar, an architectural vestige of the former priory that is usually closed to the public. Now home to the Musée de la Batellerie et des voies navigables collection of pleasure boats, the preserved architecture of this site makes it an outstanding heritage site.
> Journées du Patrimoine 2025 at the Serre du Parc du Prieuré
Over the past few years, Conflans has undergone a great deal of construction work. The town is changing, but is it really changing? Depending on the district, the impression is very different. That's what we're going to show, with current views set against postcards from the last century. This exhibition is organized by the association Conflans à travers les âges (CATLA).
> Heritage Days 2025 at Saint Maclou church
The association Conflans à travers les âges (CATLA) will be presenting the history of the church, its rich heritage and the latest work carried out, revealing to the public the traces of its past.
Around the organ of Saint-M-aclou church, plunge into a unique world of sound with two rare ancient instruments: the Serpent and the Cornet à Bouquin.
> Heritage Days 2025 at Hôtel de Ville
Conflan artist Elisabeth Liu invites you to meet her in front of Daniel Buren's work at the Hôtel de Ville to discover, exchange and create around this colorful itinerary. You'll explore the artist's fascinating career spanning more than half a century, from the 6 Bouquets pour Conflans installed in 2020 on the banks of the Seine to the polychrome Pergola, a perennial work accompanying the transformation of the town hall. The visit will be followed by a creative workshop on light at Atelier Parenthèses, ending with a coffee/tea or colored syrup.
> Heritage Days 2025 - Cruises with the Tourist Office
Come aboard a cruise ship and discover the town of Conflans-Sainte-Honorine and its history, intimately linked to the river and the barge industry, from a different angle.
Heritage Days 2025 at the Repos Cemetery
To take an interest in the Repos cemetery is to look at the evolution of funeral practices over the course of the 19th century. The cemetery reflects changes in culture and attitudes towards death and the deceased. Where are the dead buried? What materials are used? What is the place of the deceased in the lives of the living? A great opportunity to discover our funerary practices.
> Heritage Days 2025 on the front island
Walk the 1.6 km of this atypical educational trail, discover the island's flora and fauna, and enjoy one of the finest views of the city.
> Heritage Days 2025 at Priory Park
Artist Rozetta uses the monumental staircase in the Parc du Prieuré as a projection canvas for a collection of old postcards of Conflans, brought to life by artificial intelligence.
> Heritage Days 2025, the Renefer Trail
Raymond Renefer was a painter - illustrator - engraver recognized and appreciated by connoisseurs. His style and his commitment to art and culture make him a key artist of the 20th century. In particular, he helped develop the artistic influence of the Seine-Oise confluence. The town council invites you to (re)discover some of his works on this tour of the town.
> Heritage Days 2025 at the Orangerie du Parc du Prieuré
Photographer Franck Stromme unveils 45 years of photojournalism.
Meet the artist: come and immerse yourself in his work and learn about photography, Saturday September 20 from 2.30pm.
The exhibition runs until October 12 on Wednesdays, Saturdays and Sundays from 1:30 pm to 5:30 pm.
Meet the artist: come and immerse yourself in his work and learn about photography, Saturday September 20 from 2:30pm.
> Heritage Days 2025 at the Blaise Cendrars multimedia library
Before it opened its doors to readers, the Médiathèque Blaise-Cendrars housed a foundry. Its interior architecture still bears traces of this rich industrial past.
Before it opened its doors to readers, the Médiathèque Blaise-Cendrars housed a foundry. Its interior architecture still bears traces of this rich industrial past.
> Heritage Days 2025 at Halte Port Saint Nicolas
The last tug built in France in 1954, converted into a pusher in 1960, this heritage boat is listed as a Monument Historique. Discover the captain's and deckhand's quarters, the engine room and the wheelhouse. Two other heritage boats are moored at the heritage stop: a jib pontoon used as an airlock for tours of the Triton 25, and a steam tug, the Jacques, from 1905, also a listed historic monument.
Tour itineraries
In 1931, General Louis Chauvineau was commissioned to build some 260 "blocks" (concrete structures) from Conflans Sainte-Honorine to La Ferté-sous-Jouarre to create an anti-tank defense line capable of stopping motorized vehicles and covering Paris. A bike tour will allow you to discover this little-known heritage of the Second World War.
Ready to set sail for Conflans-Sainte-Honorine?
Dates and Opening Time
From September 20, 2025 to September 21, 2025
Location
Conflans-Sainte-Honorine
conflans sainte
78700 Conflans Sainte Honorine
Prices
Free
