Journées du Patrimoine 2026 in Seine-et-Marne: châteaux and hidden gems worth visiting
A weekend to push open doors that are usually closed to the public, travel through centuries of history in just a few kilometres, and rediscover a region from an unexpected angle: that is exactly what the Journées du Patrimoine 2026 promise in Seine-et-Marne. On 19 and 20 September 2026, châteaux, museums, archaeological sites and historic residences across the département throw open their doors for this 43rd edition, themed around endangered heritage and the heritage of photography.
A département with exceptional resources for this 2026 edition
Seine-et-Marne is no ordinary territory for this kind of event. With five departmental museums, dozens of châteaux and 130,000 hectares of forest, the département offers a density of heritage that is rare in Île-de-France. This weekend, dozens of sites join the celebration, from the most iconic to the least known.
And that is precisely one of the event’s greatest strengths: it is not limited to famous monuments. Lesser-known gems, often inaccessible for the rest of the year, also open their doors. The curious visitor might find themselves in the basement vaults of the château-museum of Nemours, watching a glass-blowing demonstration at a workshop in Carnetin, or standing before a restored watermill in Bussy-Saint-Georges.
Unusual sites not to miss during the Journées du Patrimoine 2026
Among the most unexpected openings, the Caveau du Saint-Esprit in Provins stands out: the last surviving remnant of a medieval hospital, this space opens exceptionally this weekend at the heart of the UNESCO World Heritage-listed medieval city. In the same town, an active archaeological excavation site also welcomes visitors on both days.
In Avon, two atypical sites are taking part in the event. The Laiterie d’Avon opens its doors on Saturday 19 September, while the Couvent des Carmes, a former 17th-century convent, is accessible on both days. In Carnetin, the Atelier la Perle d’Art offers live glass-blowing demonstrations, a rare artisanal craft to witness in person.
The archaeological site of Pincevent also has a special programme lined up, as does the Musée de la Préhistoire d’Île-de-France in Nemours, open on Sunday 20 September for archaeology enthusiasts.
- Archaeological excavation site in Provins, 19 and 20 September
- Caveau du Saint-Esprit in Provins, last remnant of a medieval hospital
- Laiterie d’Avon, open on Saturday 19 September
- Atelier la Perle d’Art in Carnetin, live glass-blowing demonstrations
- Archaeological site of Pincevent, special programme on both days
- Musée de la Préhistoire d’Île-de-France in Nemours, Sunday 20 September
The great châteaux on the programme this weekend
Lovers of royal architecture will not be disappointed. The Château de Fontainebleau has an animated programme running across both days, as does the Château de Champs-sur-Marne, which is highlighting an artistic programme. The Château de Vaux-le-Vicomte, meanwhile, has something very special in store for its visitors.
Less well known, the Château de Bourron, nicknamed the “little Fontainebleau”, opens on Sunday 20 September. The Château Royal de Montceaux, known as the château des Trois Reines, allows visitors to explore its ruins on both days. Rounding out this tour of the département’s historic residences are the Château de Brie-Comte-Robert and the château de Rosa Bonheur in Thomery, which offers both guided visits and a concert.
Museums, archives and re-enactments for all audiences
Beyond the châteaux, the Journées du Patrimoine 2026 programme in Seine-et-Marne caters to every kind of visitor. The Musée de la Grande Guerre in Meaux opens its collections on both days, with booking required. The Musée de la Gendarmerie Nationale in Melun offers a playful, arts-led programme designed with families in mind. The Musée des Transports Urbains in Chelles welcomes visitors free of charge to discover more than 70 vehicles spanning from 1863 to the present day.
For those drawn to local memory, the Archives départementales de Seine-et-Marne in Dammarie-les-Lys are hosting an introduction to genealogical research on Saturday 19 September. The Musée de la Vie d’Autrefois, meanwhile, invites visitors to immerse themselves in the crafts of the past, complete with historical re-enactments and traditional games.
Alongside all of this, city-specific programmes are planned in Meaux, Lagny-sur-Marne, Fontainebleau, Brie-Comte-Robert, Provins, Thomery, Avon and Melun, making it easy to plan your weekend around your location or interests. With such a packed schedule, it is well worth planning ahead and selecting your visits in advance to make the most of these two days.
