Attention to enthusiasts and curious minds eager for fascinating discoveries, the Journées du Patrimoine is the must-attend event of September. This year it runs from September 19–20, 2026, and it's an opportunity to explore the Île-de-France region by seeking out its essential treasures and secret gems. This 43rd edition promises a wealth of newly opened tours, free tips and family-friendly activities, and it will again be hard not to discover a genuinely inspiring outing for any passion.
Paris-region castles are also in the spotlight during the Journées du Patrimoine. Across the four corners of the Île-de-France, these sumptuous residences invite us to explore their past, offering a chance to experience a sweeping historical and cultural odyssey. In the Val d'Oise, there are treasures worth a detour.
To help you find your bearings, we’re highlighting the standout castles in the 95 department that are set to welcome visitors for these Heritage Days 2026, along with their respective programs. Also remember to check this guide regularly, as the selection grows with each new announcement and discovery.
This endangered castle with distinctive architecture opens to visitors for Heritage Days 2026.
Time-worn yet at the heart of a large restoration project, the Château de Vigny opens its doors on 19 and 20 September 2026 for Heritage Days. A chance to discover one of the most distinctive monuments in Val-d'Oise. [Read more]
Theatrical tour and new exhibition for Heritage Days 2026 at Château d'Écouen
The Château d'Ecouen and its Renaissance Museum participate in Heritage Days on Saturday, September 19 and Sunday, September 20, 2026. Take advantage of free guided tours for visitors of all ages. [Read more]
Heritage Days 2026: uncover the secrets of the Villarceaux estate in Val-d'Oise (95)
Are you near the Vexin Français Regional Natural Park on September 19 and 20, 2026? Take advantage of Heritage Days to visit the Villarceaux estate in Chaussy. [Read more]
Here is Île-de-France’s sole troglodyte castle, open to visitors for the 2026 Heritage Days.
On the occasion of the Heritage Days on 19 and 20 September 2026, discover the Château de la Roche-Guyon, a unique landmark in Île-de-France, nestled in the Val d’Oise. [Read more]
Heritage Days 2026 at Beaumont-sur-Oise Castle (95), the program
Beaumont-sur-Oise Castle opens up for Heritage Days 2026. A relic of the Middle Ages, the castle’s keep dominates the banks of the Oise and offers a splendid view of Saint-Laurent Church, to be discovered on September 19 and 20. [Read more]
Heritage Days 2026: free Van Gogh–themed tour at the Château d'Auvers-sur-Oise (Val-d'Oise)
The Château d'Auvers-sur-Oise invites you to the weekend of September 19–20, 2026, for the 43rd edition of Heritage Days. Discover the program waiting for you this year. [Read more]
Dates and Opening Time
From September 19, 2026 to September 20, 2026
Prices
Free
