Don't just roam the surface of the earth — take a peek at what's below it too. See bizarre natural formations and shapes in the deep, shadowy corners of Gouffre de Poudrey.
Need to know where to find Gouffre de Poudrey? It's in Etalans, and entry fees apply. If you've got time on your side, pay a visit to Dino-Zoo and Besancon Golf as well. They won't take long to reach from the natural underground attraction.