What if a discreet stone tower opened the secret chapters of France’s history? For Heritage Days, returning in Île-de-France on September 19 and 20, 2026, the region’s architectural gems come into view. This must-attend cultural event each autumn invites visitors to explore spaces usually closed off or little known to the public, from the streets of Paris to the medieval towns of Seine-et-Marne. Among these treasures, the keep at Moret-sur-Loing invites you to step back in time for a brief escape.
Built in the 12th century at the behest of Louis VI to guard the border with Champagne and house the court, this main keep proudly overlooks the Loing. Philip Augustus, Blanche of Castile, and later Henry IV have stayed there. Over the centuries, the military dwelling evolved into a royal prison. Legend has it that Nicolas Fouquet was held there for several weeks under the direct watch of the famous d'Artagnan after his arrest.
Left derelict after a fire during the French Revolution, the building was finally bought back in 1879 by Joanne Thirion, an art aficionado who transformed the ruin into a refined residence, handed down from generation to generation to its current owners.
Architecturally, the building stands out for its original Romanesque core: a solid square footprint, thick rubble-stone walls, and few openings. That medieval austerity converses with 19th-century refinements inspired by the Neo-Gothic movement. This style, defined by a Romantic reimagining of the Middle Ages, is expressed here through sweeping carved woodwork, monumental fireplaces, and the dramatic integration of a Gothic rose salvaged from an old church in the Yvelines.
Today, as a private property, the keep is dedicated to keeping this living heritage alive by opening its doors to the public and sharing its history with passion. Discover below the detailed programme of visits and activities planned for this exceptional weekend.
The Keep of Moret: a tour of a former royal residence
Step back in time and journey through almost a millennium of history. Near Fontainebleau stands the Donjon of Moret, a 12th‑century royal residence tucked away in its green setting. Rescued from ruin in 1880 to be restored as a pleasure residence and passed down through generations.
Access to the gardens, park, and the grand room on the second floor...
Donjon history presented by the owner in front of the Donjon’s main façade: 2:30 PM–4:00 PM–5:00 PM, Saturdays and Sundays.
Participation conditions: Paid admission: Adults €7; Children under 18 €3; Children under 5 free — No reservation required | Special rate
Hours: Saturday, September 19, 2026 — 2:00 PM to 7:00 PM | Sunday, September 20, 2026 — 2:00 PM to 6:00 PM
The Keep of Moret: A Fragrance of the Middle Ages
As part of your visit to the Donjon de Moret sur Loing, the former Royal Residence, we are offering a Perfume Workshop in the grand hall on the second floor.
Perfumes in the Middle Ages: a discovery game. Will you be able to recognize the ten scents?
The perfume workshop is free and open to all, provided you have already paid the admission fee for the Donjon visit.
Participation requirements: The Perfume Workshop is free and open to everyone, provided you have already paid the entry fee for the Donjon tour. No reservation required | Free
Hours: Saturday, September 19, 2026 — 2:00 PM to 7:00 PM | Sunday, September 20, 2026 — 2:00 PM to 6:00 PM
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Dates and Opening Time
From September 19, 2026 to September 20, 2026
Location
Moret sur Loing keep
15 Rue du Donjon
77250 Moret sur Loing
Route planner
Access
By car, approx. 1h30 drive; by train, 45min from Gare de Lyon, then 15min walk from the station. Accessible with Navigo pass.
