Best attractions and places to see around Oncy-Sur-École include a blend of historical significance, natural beauty, and cultural points of interest. The village is traversed by the École river and largely lies within the Mont Grippon massif, which features prehistoric rock carvings. Oncy-Sur-École is also recognized as the birthplace of landscape painter Simon-Mathurin Lantara and is close to the vast Fontainebleau Forest. The region offers diverse attractions, from ancient traces to notable landmarks.
Last updated: July 6, 2026
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This Lorraine cross is actually located on the gable of the maquisards. There is a beautiful view of Fontainebleau. This place also serves as a break/photo point for trailers/hikers.
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This was one of the locations used for the filming of the 3 Mousquetaires with Vincent Cassel, François Civil, Romain Dursis & Pio Marmai
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The trail moves on to the main essentials The hall In 1479, by a special grace from Louis The North-South facing Hall, 46 m long, 16 m wide and 13 m high, covers a total surface area of 730 m2. 48 oak pillars, resting on “dice”-cut stone bases, support a chestnut frame typical of Ile-de-France at that time; this frame presents to the north (on the rue Langlois side) a “pavilion” farm. Today, La Halle is still the site of a market on Thursday afternoons. The square, the houses gathered all around, bear witness to the great commercial activity which already reigned in the region 500 years ago. La Halle has been classified as a Historic Monument since 1923. Bonde Castle is located near the town center of Milly-la-Forêt, Built near an artificial island in the l'École river to the west of the Notre-Dame collegiate church, its park is bordered to the west by the course of the river which forms a moat to the north protecting the châtelet. History Built in the 12th century by the lords of Milly, the castle was ruined during the English siege in 1432. At the end of the 15th century around 1475, owned by Admiral Louis Malet de Graville, it was rebuilt and enlarged. What was then the keep became the entrance gatehouse, the drawbridge was replaced by a permanent stone bridge and a gate closed access between the northern defense tower and the governor's house. A square courtyard was surrounded by a wall and had in the center a chapel dedicated to Saint Valentine. The castle was successively the property of Hugues III de Bouville, Olivier V de Clisson, Jean II de Montmorency, Jean-François de Faudoas d'Averton, Marc-Antoine Front de Beaupoil de Saint-Aulaire and Pierre Marie of Lau d’Allemans. In the 19th century, the towers of the chatelet were enhanced with brick battlements and a slender roof. In 1859 the Corne bridge was rebuilt near the castle washhouse which served as a watering trough for the animals. At the end of the 20th century the mills along the river were demolished. In 1964, the Bonde washhouse downstream of the river which was part of the estate was rehabilitated. On December 20, 1972, the castle was partly listed as a historic monument. The park was listed in 1991 for its fences, canals and paths. the house of Jean Cocteau. Entrance to the J. Cocteau house [This 17th century residence, flanked by turrets, was formerly called the Governor's House. It corresponds to an old outbuilding of the castle in front of which the vassals came to pay homage and faith to their lord. Jean Cocteau bought this house with Jean Marais in 1947 and lived there until his death. Notre-Dame de l’Assomption Church Founded in the 11th century, the former chapel of the castle, it was rebuilt around 1485 on the orders of Admiral de Graville in the Gothic style of the 13th and 14th centuries. The bell tower, 57 meters high, dates from the 11th century in its lower part and from the 12th and 13th centuries in its upper part. The arch of the main portal in the primitive Romanesque style comes from an old church in Milly (Saint-Pierre or Saint-Jacques). On the east side of the bell tower - Place Grammont side - the arms of Admiral de Graville are still visible. Many works of sacred art are found inside the church. The church was listed as a Historic Monument in 1926. The dovecote; Located on the old triangular square of the dovecote cul de sac, this old building was part of the Domaine du Moustier, property of Fulbert I, lord of Milly and officer at the court of Dagobert I in the 7th century. Destroyed in 1432 or 1433, the complex included a vast farm. According to a count in 1792 it had around 1200 niches. Only the lords held the right to build these premises designed for breeding. The Moustier de Péronne gate is one of the oldest vestiges of Milly and dates from the 7th century. It provided access to the moustier (monastery in old French) owned by Fulbert I, who obtained the land of Milly from Dagobert I. His son Wulfran was born there around the year 635. Entering religion, he became the apostle of the frieze (Netherlands), then bishop of Sens before retiring to Saint Wandrille where he died in 720.
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There is no classic wayside cross (sometimes called a field cross in the open field) or a summit cross that crowns a mountain, but a rock engraving. The lower half of the drawing—whenever scratched into the rock—shows a chalice, such as might be used at Eucharistic celebrations. The outer edge of the vessel is decorated with a cross. Another great cross grows out of the chalice itself. Whether this rock engraving is actually connected to the order of the Knights Templar (the exact name was “Poor Knighthood of Christ and the Temple of Solomon in Jerusalem”), as indicated as a question in the highlight title, I cannot judge. In this case it would have to go back to the 12th or 13th century, i.e. it would have to have been preserved for a very long time.
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This small sacred monument, in the shape of a "Croix de Lorraine," rises majestically on the Pignon des Maquisards. The structure consists of several elements: a two-tiered foundation above the rock, followed by a brick base containing a plaque with a dedicatory inscription. On top of this rests a brick obelisk, tapering slightly towards the top but not terminating in a point. Above the obelisk, the actual cross, visible from afar, stands enthroned in its typical form with two horizontal crossbeams.
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Great view, possibility to sit down for a break
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Oncy-Sur-École is rich in history. You can visit the birthplace of landscape painter Simon-Mathurin Lantara, marked with a commemorative plaque. The village also features the Ferme du Clos d'Artois, known for its historical significance and as the last producer of Milly peppermint. Nearby, explore the impressive Fleury-en-Bière Castle, a private property showcasing historical architecture, and the magnificent Domaine de Courances, a 17th-century castle with remarkable Renaissance water gardens.
Yes, Oncy-Sur-École is surrounded by natural beauty. The village itself is traversed by the École river and largely lies within the Mont Grippon massif, where you can find prehistoric rock carvings. The area is also very close to the vast Fontainebleau Forest, a renowned natural area perfect for outdoor activities and exploring diverse ecosystems.
Beyond Oncy-Sur-École, several cultural sites are easily accessible. In nearby Milly-la-Forêt, you can visit the Maison de Cocteau, the former residence of Jean Cocteau, and the Chapelle Sainte-Blaise-des-Simples, decorated by Cocteau. Don't miss Le Cyclop de Jean Tinguely, a monumental sculptural work hidden within the Milly forest, offering a unique contemporary art experience.
The region offers a variety of outdoor activities. You can enjoy hiking, running, and road cycling. For detailed routes, explore the Hiking around Oncy-Sur-École guide, the Running Trails around Oncy-Sur-École guide, or the Road Cycling Routes around Oncy-Sur-École guide. The nearby Fontainebleau Forest is also excellent for hiking, horse riding, and kayaking.
Families will enjoy the Domaine de Courances with its extensive gardens and castle, offering plenty of space to explore. The Fleury-en-Bière Castle, while private, is impressive to view from the outside. The natural areas, including the École river and the Mont Grippon massif, provide opportunities for outdoor adventures suitable for families.
For unique local experiences, consider visiting the Miellerie du Gâtinais in Boutigny-sur-Essonne, a honey farm where you can discover its medicinal garden and shop for local produce. Additionally, the Verrerie d'art de Soisy-sur-École offers art glass creations.
The Mont Grippon massif is a significant natural feature of Oncy-Sur-École. Its rocky slopes bear evidence of prehistoric life, with numerous Mesolithic rock carvings discovered there. Archaeological finds also indicate Neolithic settlements engaged in agriculture in the area, making it a site of ancient historical interest.
Yes, the Domaine de Courances is a must-visit. This 17th-century castle boasts remarkable Renaissance water gardens, fed by 14 springs that supply 17 bodies of water, water staircases, and cascades. The estate covers 75 hectares and includes the castle, gardens, and a vegetable garden. The former hemp-fulling mill, La Foulerie, now serves as a tea room overlooking a Japanese Garden.
Visitors appreciate the blend of historical depth and natural beauty. The Cross of Lorraine on the Maquisards' Pignon is noted for its magnificent views and as a place for a pleasant break. The grandeur of Fleury-en-Bière Castle and the relaxing green setting of Domaine de Courances with its refreshing pools and streams are also highly praised.
Oncy-Sur-École is the birthplace of the 18th-century landscape painter Simon-Mathurin Lantara, often considered a precursor to the Barbizon School. His childhood home is marked in the village. Nearby, Milly-la-Forêt has strong ties to Jean Cocteau, whose former residence and the chapel he decorated are significant artistic sites.
Milly-la-Forêt is a charming town near Oncy-Sur-École with a rich history. It features a historic market hall, dating back to 1479, which still hosts a market. You can also find the Château de la Bonde, the Maison de Jean Cocteau, and the Collegiate Church of Our Lady of the Assumption, which has parts dating back to the 11th century.
The natural beauty of the region, including the École river and the Fontainebleau Forest, can be enjoyed throughout the seasons. The Domaine de Courances, for example, encourages visitors to discover its charms year-round, with different aspects to appreciate in each season.


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