Behind the steep rock walls of Calanda massif a historical pass lurks over Kunkelspass. The pass connects different Maiensäss (typical farmhosues), going over to Reichenau, where Vorder and Hinterrhein join. Away from the tracks alpine marmots run over fertile meadows.
Europe's largest subterranean lake that can be sailed upon lies between Sion and Sierre. The water grotto is easily accessible and there is a boat tour for viewing it. The guides on the boat tell visitors about the history of the cave and its geology.
If brooks and rivers run only sluggishly above ground, hydropower is nearly impossible to harness. That is why the inhabitants of the valley of Le Locle began to use subterranean streams. This is how the cave mills of "Col-des-Roches" arose.