Fort du Sapey is a military fortress, part of the Maginot Line's Alpine extension, at an elevation of 1.725m (5,659ft) above the sea level, located in the Savoie department in the Auvergne-Rhône-Alpes region in south-eastern France.
The road to the fort is gravel, rocky, tippy and bumpy at times. The road is usually impassable from October to June (weather permitting). Expect a trail pretty steep. The road is not easy, though. Up, down, right, left all the time. The fortress was built in 1931. It is currently abandoned but can be visited. The fort lies on a hill that dominates the entire valley. The garrison consisted of 150 men. The road is closed to private motor vehicles.