The Green Woman from Geisingberg.
While searching for his stray goat, a poor boy finds a white lily. When he picks the flower, a woman dressed in green speaks to him: "Touch this stone with the flower!" Then the mountain opened and a grotto full of gold, silver, precious stones and pearls appeared. The woman said, “Take as much as you can carry.” That wasn't enough for the herd boy. He ran home to get a car. When he returned, he found the cave locked. He had forgotten the lily in there. In the mountain he heard the green woman crying and complaining that she now has to wait another hundred years to be freed from the mountain.
In the Jungernbrunnen behind you, the tears of the Green Woman from Geisingerberg flow - she is still waiting for her liberation.