For the 2026 edition of the Journées du Patrimoine, hosted on Saturday, September 19 and Sunday, September 20, 2026, Île-de-France unveils its little-known gems and hidden treasures. This is the time of year when curious minds and history enthusiasts swing open the doors of exceptional places, often closed to the public, to celebrate the rich Francilian heritage. In Mandres-les-Roses, a small commune famed for its horticultural tradition, awaits a pastoral yet historic journey inside a singular built ensemble: the renowned Ferme de Monsieur.
The name is bound to intrigue: who exactly was this famed “Monsieur”? In the Ancien Régime, this title referred to the king’s younger brother, here Louis-Stanislas-Xavier, Count of Provence and future Louis XVIII. According to local tradition, the prince is said to have acquired this property toward the end of the 18th century to establish a model farm and stock his tables, making the most of the fertility of the Briard plateau.
Architecturally, the Ferme de Monsieur epitomizes the great estates of Brie in days gone by: a vast enclosed courtyard, stone buildings in meulière and limestone, expansive lofts and barns with sturdy timber frames built to store fodder and harvests. Bought and restored by the municipality, the building has traded its straw boots for an active community and cultural life, now housing municipal rooms, exhibition spaces, and gardens open to strolling. Ready for a time-travel escape on the doorstep of Paris? Discover what awaits you on site without delay:
Guided tour of Monsieur's farm
Guided tour of Monsieur's Farm, tracing its history and the traditional farming practices from its origins to the present day
Participation conditions: Free | No reservation required
Timings: Sunday, September 20, 2026 - 2:00 PM–3:00 PM, 4:00 PM–5:00 PM
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Dates and Opening Time
On September 20, 2026
Location
Monsieur's Farm
4 Rue du Général Leclerc
94520 Mandres les Roses
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