Emosson Dam will require some muscle. Recently the dam wall was raised by another 20 m as part of a spectacular engineering project, currently under construction, whose heart lies deep in the rock under hikers feet. Highlights Thrilling ride up to start of walk on trio of mountain railways Dramatic alpine scenery 2 dams, 2 reservoirs Restaurant / mountain refuge at each dam The oldest fossil tracks of vertebrates in Switzerland. Two vertical tunnels, each 100 m taller than the Eiffel Tower, will carry water between the two reservoirs. Ok I Agree, learn More.