Go in search of the many Gallic vestiges scattered over this vast semi-wooded plateau; and in particular the vaguely anthropomorphic menhir named Alesia goddess. Visit the small museum collecting ancient finds collected on the site. Hiking in the forest behind Cornu, the site supposedly Alesia.
For intrepid: visit, very carefully, the rock arch called the fireplace. Warning ! The path from the bottom requires extreme caution because the feel is very narrow along a steep slope.