The Erdmannliloch in the Bachsertal is not just a small cave in an impressive Nagelfluhwand.
Because the remains of the wall come from the Grottenburg Hohfluh, which is the only known cave castle in the canton of Zurich.
Very nice old cave. The spacious cave of the Neolithic hill settlement was inhabited until 6000 years ago. Absolutely awesome. You can enjoy a great view and the cave is superb.