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.
Heritage Days 2026: a spotlight on the Musée du Vexin Français, nestled in the heart of the Château de Théméricourt (Val-d'Oise, 95)
Set off to explore the Domaine de Théméricourt and its interactive museum for the 2026 Heritage Days. A great family outing in the Val-d'Oise. [Read more]
Heritage Days 2026 at Montgeroult Castle: an exceptional opening on the agenda
Every autumn, Île-de-France reveals its best-kept historical secrets. For Heritage Days 2026, head to Val-d'Oise to swing open the gates of Montgeroult Castle, an architectural treasure that is exceptionally opening its doors to the public. [Read more]
Journées du Patrimoine 2026: Château de Vigny, a little-known gem in Val-d'Oise to discover
Longclosed to the public for years, the Château de Vigny opens to visitors on September 19 and 20, 2026. A chance to learn more about this historic monument undergoing restoration on the doorstep of Île-de-France. [Read more]
Exclusive tours and a never-before-seen exhibition at the Château d'Écouen for the 2026 Heritage Days.
The Château d'Écouen and its Renaissance museum are taking part in Heritage Days on Saturday, 19 and Sunday, 20 September 2026. Take advantage of free guided tours for visitors of all ages. [Read more]
Heritage Days 2026: Villarceaux estate lifts the veil on its secrets this weekend
Are you near the Parc naturel régional du Vexin français on September 19 and 20, 2026? Take advantage of the Journées du Patrimoine to visit the Villarceaux estate in Chaussy. Here is the lineup of activities. [Read more]
Heritage Days 2026: guided tours of the stunning Château de la Roche-Guyon (95)
What if we took advantage of Heritage Days, on Saturday 19 and Sunday 20 September 2026, to visit an astonishing troglodyte landmark in Île-de-France: the Château de la Roche-Guyon, located in Val-d'Oise. [Read more]
Heritage Days 2026: Weekend tours of Beaumont-sur-Oise Castle (95)
Beaumont-sur-Oise Castle unfolds during these Heritage Days. A medieval relic, the castle’s keep dominates the banks of the Oise and offers a splendid view of Saint-Laurent Church, to be explored on 19 and 20 September 2026. Discover the program! [Read more]
Heritage Days 2026 at Château d'Auvers-sur-Oise (Val-d'Oise): free admission to the Van Gogh exhibition
Le Château d'Auvers-sur-Oise welcomes visitors this weekend, September 19–20, 2026, for the 43rd edition of the European Heritage Days. Discover the program waiting for you there this year. [Read more]
Dates and Opening Time
From September 19, 2026 to September 20, 2026
Prices
Free
