Best natural monuments around Boissy-Aux-Cailles are situated within the Parc Naturel Régional du Gâtinais Français, an area recognized for its distinctive geological formations and extensive woodlands. The region is characterized by unique sandstone formations, often referred to as "Grès de Fontainebleau," and the presence of "Cailles," which are small, naturally polished stone balls. The landscape is further defined by expansive forests, including parts of the renowned Forest of Fontainebleau, and various valleys. These natural features offer diverse environments for exploration…
Last updated: July 5, 2026
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Not hard to see the elephant shape of the rock. Some nice paths and trails around.
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The cyclops visit is not free, 12 euros entry but it lasts 45 minutes and is very interesting. Limit of 25 people at a time. Please note that photos inside are prohibited. I recommend the first visit at 10:30 a.m. (less crowded)
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…without forgetting the famous “dog’s ass” 🙂
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This sculpture, made of concrete and iron, represents the fantastic creature from Greek mythology which gave its name to the work. 22.5 meters high, the sculpture is a project by artists Jean Tinguely and Niki de Saint Phalle, carried out between 1969 and 1994. On site, you can also discover two other works: the Face of Mirrors and the Tribute to the Deportees. Visiting all the monuments is completely free.
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A surprising space in the middle of the forest of Fontainebleau, the sands of Cul de Chien originated 30 million years ago. At the time there was a warm ocean here that deposited quartz in its depths. Time doing its work, it disintegrated into sand, forming this beach in the middle of the woods. In addition to the surprising environment, the sands of Cul de Chien represent a mythical place in the history of climbing in Fontainebleau.
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View of Larchant and its clearing.
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Beyond the well-known spots, visitors frequently enjoy the unique geological formations like the Béorlots Sand Dune, a testament to ancient marine deposits. Another fascinating site is The Cyclop, which, while a man-made monument, is deeply integrated into the natural landscape and offers a playful experience.
The region is characterized by its distinctive geological formations, particularly the 'Grès de Fontainebleau' sandstone formations, which create 'chaotic' landscapes and impressive block fields. You'll also find 'Cailles,' small, naturally polished stone balls, and expansive forests, including parts of the renowned Forest of Fontainebleau.
The natural monuments are excellent starting points for various outdoor activities. You can explore numerous hiking trails, such as the 'Boissy-aux-Cailles Valley Trail' or the 'Chapelle des roches aux amis loop from Buthiers.' For cycling enthusiasts, there are gravel biking routes like the 'Belvedere Trail – Panorama loop from Oncy-sur-École.' You can find more details on these activities in the hiking guide, gravel biking guide, and running guide for the area.
Yes, several natural sites are suitable for families. The sand dunes, such as Les sables du Cul de Chien, offer a unique environment for exploration and play. The extensive forests of the Gâtinais and Fontainebleau also provide gentle paths for family walks and picnics.
The region's natural monuments can be enjoyed throughout the year. Spring and autumn offer pleasant temperatures for hiking and exploring the forests, with vibrant foliage in autumn. Summer is ideal for outdoor activities, though it can be warmer. Winter provides a serene, often quieter experience, especially in the forests.
While primarily natural, the rock formations in the nearby Forest of Fontainebleau contain over 2,000 caves with ancient rock carvings, predominantly geometric etchings from the Mesolithic period. These sites, such as the Vallée du Jeton rock shelter, offer a fascinating blend of natural history and ancient human culture.
Generally, dogs are welcome on many trails and in the forests of the Gâtinais and Fontainebleau. However, it's always recommended to keep them on a leash, especially in protected areas or during certain seasons, to protect wildlife and ensure a pleasant experience for all visitors. Specific rules might apply to certain natural monuments or reserves.
Visitors are often surprised by the diverse landscapes, from the unique sandstone formations to the unexpected sand dunes in the middle of the forest. The opportunity for bouldering and climbing on the rocks, combined with the peaceful forest environment, is also highly appreciated. Many enjoy the expansive views, such as those from Dame Jouanne Viewpoint.
Access to some natural monuments and trailheads around Boissy-Aux-Cailles is possible via public transport, though it may require some planning. The region is served by local bus lines connecting to train stations. For specific routes and schedules, it's advisable to check local transport websites or consult the tourist information for the Parc Naturel Régional du Gâtinais Français.
The village of Boissy-Aux-Cailles itself, and nearby towns like Milly-la-Forêt, offer various amenities including cafes, restaurants, and accommodation options. These villages serve as convenient bases for exploring the surrounding natural monuments and forests.
For a comfortable visit, especially if you plan to hike or explore, we recommend bringing appropriate footwear, water, snacks, and sun protection. A map or a GPS device is also useful for navigating the trails. If you're interested in climbing, ensure you have the necessary equipment.
The entire Parc Naturel Régional du Gâtinais Français is rich with hidden corners. Beyond the main highlights, exploring the numerous unmarked paths and smaller forest sections can reveal quiet glades, unique rock formations, and diverse flora and fauna that are less frequented by visitors. The geological diversity means there's always something new to discover off the beaten path.


Extend your search for the best caves by checking out these guides of the top ones around Boissy-Aux-Cailles: