The Journées du patrimoine 2026, organized on the weekend of 19 and 20 September, invites visitors once again to discover places that tell the history of Île-de-France, sometimes far from the best-known landmarks. In Bazemont, in the Yvelines, an old seigneurial estate opens its doors, offering a glimpse into centuries of evolution of a village marked by its architectural heritage.
The Bazemont Castle dates back to the late 16th century, when Charles d'O, a member of a powerful noble family, had a Renaissance-style residence built. In the 18th century, the estate underwent a major restructuring under Louis-Pierre Parat de Chalandray, the last lord of Bazemont. He removed one of the medieval towers, added a new wing, laid out an English-style park, and oversaw the construction of several outbuildings, some of which remain visible today. An aerial gallery that once connected the castle to the Saint-Illiers Church still testifies to the distinctive layout of this former seigneurial domain.
Unlike many historic estates that have become private residences, the castle finds a new lease on life in 1893 when it is acquired by the town. It has housed the town hall, municipal services, and for a long time the village schools. This conversion helped preserve a patrimonial ensemble that remains an everyday part of life for residents today.
The domain’s exceptional opening for Heritage Days offers a clearer window into Bazemont’s history and a chance to explore the remains of this old feudal lordship, alongside Saint-Illiers Church and the surrounding buildings. A prime opportunity to gain a fresh perspective on the heritage of the Yvelines and on these sites that, centuries on, continue to live and evolve at the heart of the Île-de-France region.
Guided tour of the Bazemont church and its seigneurial estate
Guided tour of Saint-Illiers Church and the lordly estate. The circuit begins at 2:00 PM near the church in the village center. Participants can join the group partway through the visit.
Your local contact: Mrs. Christiane Hubert - 06 50 42 81 47
Note: only one tour per afternoon
This picturesque excursion is part of a circuit that also includes Herbeville, Maule, and Bazemont. See the corresponding sheets.
Participation conditions: Free admission - No booking required
Times: Saturday, 19 September 2026 — 2:00 PM to 4:00 PM | Sunday, 20 September 2026 — 2:00 PM to 4:00 PM
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Dates and Opening Time
From September 19, 2026 to September 20, 2026
Location
Bazemont Castle
château de bazemont
78580 Bazemont
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