There is still a glacier in Jura. Close to La Brévine, the siberia of Switzerland, is Glacière de Monlési. There is a parking at the start of the trail. The closest bus station is Les Sagnettes, Bif. Charbonni. It's a 20 minute hike, and there are info board at the entrance. Since you are going to walk on ice, crampons are advisable. There is one spot, where you can abseil 5 m.