The Frau Holle-Loch is a small cave that is framed by mighty basalt blocks. There are many crazy stories about the Frau Holle-Loch. It is located in the swampy meadows between Frischborn and Hopfmannsfeld.
"There is the entrance to the magnificent castle of Frau Holle, which is deep underground and is only left by her now and then at noon to show herself to the human children in the Sauzahl. So once there, the Frischbörner guarded Shepherd. Suddenly the pig number came and wonderful music sounded around him, so beautiful as he had never heard it before. But he was terrified and drove his flock into the village, where he had to tell everyone the miraculous tales. "
Source: Theodor Bindewald, Oberhessisches Sagenbuch, Frankfurt 1873