The UNESCO World Heritage high trail from Bettmerhorn to Eggishorn. It's a breathtaking and challenging hike, going from 2647 m up to 2869 m, with the amazing view of the Great Aletsch Glacier during the whole route. Only for people with a good head for hights. You walk along the ridge all the time following the blue and white trail marks. I still can't believe we did it!