A not-to-be-missed event, the Journées du Patrimoine (Heritage Days) offer an exceptional dive into the heart of France's heritage. Monuments, hidden stories and cultural encounters await the curious for unforgettable moments of discovery. This year, on the weekend of September 20 and 21, 2025, to be precise, the town ofOsny, in the Val-d'Oise region of France, promises some great visits and events for the occasion.
From its Gallo-Roman origins to the present day, Osny has retained its authentic character while embracing modernism. Its old stone houses, Saint-Pierre-aux-Liens church and the grounds of the Château de Grouchy bear witness to a rich past that blends harmoniously with its present-day dynamism.
Why is Osny a must-see during the Journées du Patrimoine? This pearl of the Val-d'Oise will be revealing its historical secrets through fascinating guided tours. Activities, workshops and exhibitions will captivate visitors of all ages. Osny is a unique experience combining culture, history and conviviality. So, shall we come to Osny, my friends?
Grouchy Castle
Le Ballet Imperial invites you to discover the refined and spectacular world of the Belle Époque, through a series of artistic animations and historical dances designed to offer total immersion.
On the program for both days:
- From 2pm to 6pm, a costume exhibition tracing the evolution of women's and men's fashion during the Belle Époque;
- 2:30 pm, dress-up conference on period fashion, with dress-up demonstrations;
- 3:15pm & 5pm, dance demonstrations from the 1900s, with historical choreography presented in period high society costumes;
- 4pm, men's fashion presentation.
Éric Vanel
Nurtured by ancient myths and the imaginary worlds of modern literature, Éric Vanel seeks to touch the soul with his vivid figurative sculptures of powerful, expressive attitudes. His work will take you to the frontier between the real and the fantastic.
Alexandre Lamotte
Drawing has been an important part of Alexandre Lamotte's life since childhood. He uses very few colors, just gray, white and black, and paints only women who seem to be suspended. These sleeping, dreamy figures give an impression of silence, serenity and softness, but also of weightlessness.
With the game Si Osny m'était conté (If Osny were told to me), come along with your family and discover the history of the château and its inhabitants in a fun way. By the Friends of Grouchy association.
Sunday September 21st
Les Amis de Grouchy will open their winery and reveal the secret of growing Petit Robinson vines. You'll even be able to taste their wine (in moderation!).
Église Saint-Pierre aux Liens
For the European Heritage Days, the parish team is opening the doors of Saint-Pierre-aux-Liens Church on Sunday September 21, from 2 to 6 pm.
Guided tours are available on request. An opportunity to learn more about the history of this 900-year-old church.
Grouchy Gallery
Let yourself be carried away by Sybil Aubin's unique artistic universe.
Free to experiment and imagine, she draws inspiration from the human condition and its contradictions to create her works. Graphite, mineral and the synthetic ink of the pen are all techniques that enable her to interweave different time-spaces and subjective realities. You'll be immersed in an introspective stroll through his life-story works.
The artist will be present on September 20 and 21 from 2pm to 6pm.
William Thornley Museum
Aucun événement annoncé à ce jour, le programme est mis à jour en fonction des annonces officielles.
Grouchy Park
Exhibition, September 20 to October 12
Trees are an indispensable part of our daily lives. They soothe us, fill us with wonder, inspire us and, above all, contribute to making our air breathable. Parc de Grouchy is a veritable green lung in our city. Come and discover its most beautiful trees through photographs and texts proposed by the Friends of Grouchy association.
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Dates and Opening Time
From September 20, 2025 to September 21, 2025
Location
Osny
osny
95520 Osny
Access
Transilien line J Osny station
Prices
Free
Official website
osny.fr
