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 at the Château‑Museum of the French Vexin: a historic foray into the heart of the Val-d’Oise (95)
Head to Théméricourt in Val-d'Oise to explore the Vexin Français Museum during Heritage Days 2026. Discover the secrets of the Renaissance château and the treasures of our Île-de-France terroir. [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 : discover the Château de Vigny, a monument rescued from ruin
On September 19 and 20, 2026, the Château de Vigny opens its doors to the public. A visit to discover a Renaissance-era landmark in the Val-d'Oise, at the heart of an impressive restoration project. [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: Discover the secrets of the Villarceaux estate (95)
Are you heading to the Parc naturel régional du Vexin français for the weekend of September 19–20, 2026? Take advantage of Heritage Days to visit the Villarceaux estate in Chaussy. [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]
Discover Beaumont-sur-Oise Castle during Heritage Days 2026
Beaumont-sur-Oise Castle takes center stage in this year’s edition of Heritage Days. A medieval relic, the castle’s keep looms over the banks of the Oise and offers a stunning view of Saint-Laurent Church, to be explored on September 19 and 20, 2026. [Read more]
Heritage Days 2026: a tour through Van Gogh’s world at the Château d’Auvers-sur-Oise (95)
The Château d'Auvers-sur-Oise is inviting you to the weekend of September 19–20, 2026, for the new edition of Heritage Days. Discover the program lined up for you this year and book your tickets. [Read more]
Dates and Opening Time
From September 19, 2026 to September 20, 2026
Prices
Free
