Exceptional openings and visits of the heritage of Val-d'Oise
The European Heritage Days in Val-d'Oise open the doors of hundreds of monuments, historical sites, castles, abbeys, museums and places usually closed to the public every September. The department, rich in exceptional heritage between medieval Île-de-France and 19th-century architecture, offers a weekend of free discoveries that attracts tens of thousands of visitors to emblematic places and hidden treasures of Val-d'Oise.
The European Heritage Days in Val-d'Oise are one of the most popular cultural events in the department. Every third weekend of September, in accordance with the national calendar coordinated by the Ministry of Culture, hundreds of sites open their doors for free or offer special activities for the general public.
Val-d'Oise has an exceptionally rich heritage, often unknown to the general public. Founded on a territory that was at the heart of medieval and royal Île-de-France, the department's treasures include:
Each year, the Heritage Days are organized around a national theme — "Living Heritage", "Heritage of Itineraries, Routes and Networks", "Maritime Heritage", etc. — which each territory adapts to its own specificities. In Val-d'Oise, this annual theme is an opportunity to highlight little-known aspects of local heritage and invite new discoveries.
Beyond simple openings, the Journées du Patrimoine du Val-d'Oise offer numerous activities: guided tours commented by historians and specialists, workshops for children to discover heritage trades, historical reenactments, concerts in heritage settings, and temporary exhibitions.
In the spirit of the European Heritage Days, all activities offered by participating sites are free or at reduced prices. This free access is a unique opportunity for the inhabitants of Val-d'Oise to discover places that are usually ticketed or closed, and for external visitors to explore a department often overlooked in favor of Paris and its immediate surroundings.
European Heritage Days 2026 in Val-d'Oise: exceptional openings of heritage sites, free guided tours and activities throughout the department. Program to be confirmed.
The European Heritage Days 2026 will once again allow free exploration of the heritage riches of Val-d'Oise. Castles, abbeys, museums, historical monuments, and unusual sites will open their doors on September 19 and 20, 2026, for an exceptional weekend of discovery.
The detailed program will be published on the website of the Ministry of Culture and the Department of Val-d'Oise in the fall of 2026.
Hundreds of sites participate in the Heritage Days in Val-d'Oise. The complete list is published on the website of the Ministry of Culture and the Department of Val-d'Oise.
Varies by site. Consult the detailed program on journeesdupatrimoine.culture.fr for access information for each location.
Free admission to most sites for both days of the Heritage Days.
Department of Val-d'Oise — Cultural Department
2 avenue du Parc, 95032 Cergy
Tel: 01 34 25 30 30
Website: valdoise.fr
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Sites patrimoniaux du Val-d'Oise
Divers sites du département, 95000 Cergy