The good 20m deep cave, which is written with dragon cave. From the wide entrance, which you can enter while crouching, continue standing in a semicircle to a small opening further along the path.
Karst cave - the first stage is still doable without any equipment, but then it quickly goes down steeply and dark, so you can only continue with the appropriate equipment
A 50m long tunnel in the Nagelfluhfels, the two entrances of which can be found along the edge of the forest. Over two 2m high, only the entrances are reinforced with masonry and the openings must be entered while crouching.