Aareschlucht is a limestone ridge formed through thousands of years by the Aare Glacier. It is a perfect short day trip if you are staying in Interlaken. You will experience incredible rock formations, water falls, amazing caves, beautifully colered water, and much more. It is an "easy to moderate" hike. Entry is 10 CHF, and you can take the train to the end of the hike and walk back (recommended if you are not coming for a hike).