St. Petus Caves and Falls Wonderful and very spacious caves, where you will find rooms and natural waterfalls that will amaze you with their beauty. Legend says that the dragon took refuge in these caves when the monk Beatus chased him. You can tour these underground caves to see mirror lakes, subterranean waterfalls, and stalagmites. The whole area is very beautiful. Although you will be exhausted at the end of the day after visiting these caves, the memories of the trip will be etched in your memory forever, don't miss out on the opportunity to visit this wonderful natural place if you are in Interlaken.