The Grottes des maquisards in Marolles-Les-Buis are caves that were used by French resistance fighters during World War II, where they trained and prepared for the liberation of Nogent-le-Rotrou in August 1944. You can explore the caves and see the traces of their activities, as well as a commemorative plaque. Along the way, you can enjoy views of the countryside and the Vinette River. The caves are not accessible to the public, but you can admire them from the outside and imagine the courage and determination of the maquisards. It is a hike that will make you appreciate the beauty and history of this region.