Even the ancient inhabitants of pile-dwellings chose Erlach on Lake Biel and St. Peter's Island as their abodes. The Romans too left traces. Bishops and members of the nobility ruled from here in the Middle Ages. Today both are popular destinations for nature lovers and visitors seeking rest and relaxation.
The Greina Plateau lies between the cantons of Graubünden and Ticino. Even as early as the Roman era, important routes across the Alps led through this region. The plateau has remained an untouched jewel because it is still only reached on foot.
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.