Nestled in the heart of the Yvelines, and more precisely in Maurepas, a solitary stone silhouette subtly marks the landscape of the Yveline plateau, overlooking the Mauldre valley. The Maurepas Keep stands as the last remnant of a medieval fortress built in the 12th century, now in ruins. Remarkably, it is the only vaulted keep of its kind still standing in Île-de-France today.
These buttresses are projecting masonry pillars attached to the exterior wall, designed to reinforce the structure's stability and withstand attacks. A medieval construction technique that highlights the careful attention paid to the site's defenses, making this relic all the more rare in the region. Standing 20 meters tall, it rests on a modest castle mound and is listed as a historic monument by decree dated July 19, 1926.
The history of this site predates the Middle Ages. In 768, Pepin the Short granted the land to the Abbey of Saint-Denis, but Norman invasions quickly forced the abbey to relinquish its holdings to a local family, whose name, Malrepast, is believed to mean "bad passage." It was this same family that constructed an initial wooden keep on an artificial mound—designed to broaden their view in case of attack. In the early 12th century, this wooden fortification was replaced by a sturdy stone fortress. The tower, standing 20 meters tall, was surrounded on the southern side by a moat, built on a small mound. Overall, the defensive complex measured approximately 65 meters in length and 30 meters in width. For those interested in a deeper dive into the site's architectural history, detailed information on the materials and dimensions can be found at montjoye.net, a reputable resource on castles in the Île-de-France region.
It was during the Hundred Years' War that the castle's fate truly took a turn for the worse. The lords of Malrepast fled, abandoning the fortress to decay. A certain Haymon de Massy, a notorious bandit lord, quickly seized the opportunity and took control of the site with his gang, ravaging the surrounding lands. In 1425, the English eventually brought an end to this chaos, and in the 15th century, following orders from the Earl of Arundel, they largely destroyed the castle's keep. After the conflict, the Maurepas estate was returned to the Chevreuse family, but the castle itself was never restored from its ruins. For a detailed timeline of these events, visit the Wikipedia page on the Donjon de Maurepas.
All that remains of the ancient defensive structure is this cylindrical tower, positioned beside a farm as a silent guardian of the old village. Its thick walls, nearly two meters wide, along with four flat buttresses and crenellated loopholes, still reflect the military architecture of the feudal era. You can easily find it on Rue de l'Église in the historic heart of Maurepas and admire it from the road. To see it in its natural setting, the best option is to include it in a 3.5 km loop hike offered by AllTrails, which connects the tower to the Courance Basin—a pond nestled in the Maurepas forest that attracts a variety of bird species. The walk takes about an hour—a gentle route perfect for families. While you're there, take the opportunity to visit the beautiful Saint-Sauveur Church and soak in the timeless atmosphere of this corner of the Yvelines, located at the edge of the Haute Vallée de Chevreuse Regional Natural Park.
For those seeking a more immersive experience, the adventure doesn't have to end after the walk. Calm and private, the Gîte du Donjon spans 160 m² and overlooks a peaceful, enclosed courtyard secured by an electric gate. It’s directly adjacent to the owners’ residence. On the ground floor, a spacious living area opens onto a fully equipped kitchen, with a sitting room featuring a wood-burning stove and a convertible sofa—ideal for cozy winter evenings. Upstairs, five bedrooms accommodate up to 12 guests, and a pétanque court has been added to the property for lively summer evenings. Rated 4.9 out of 5 based on 25 reviews, the gîte starts at €139 per night, including charges and linens—a very reasonable option for a weekend getaway with family or friends in the Yvelines. The La Verrière train station, just 3 km away, offers direct routes to Paris Montparnasse, Versailles, and Saint-Quentin-en-Yvelines, making it especially convenient for visitors without a car. Check all availability on the official Gîte du Donjon website or directly via Gîtes de France Yvelines.
This detour is perfect for medieval history enthusiasts, families looking for a scenic and easy nature walk, and anyone who loves discovering ancient stones away from the usual tourist spots. Those eager to continue exploring the forgotten fortifications of Île-de-France might also find interest in the Châteaufort Keep in the Yvelines, or the Montlhéry Keep in Essonne — two other medieval landmarks worth visiting.
Prices
Free
Recommended age
For all
