Legends run around the castle of Haut-Koenigsbourg. A young lady wearing a long yellow dress would come to the citadel around noon, but only children born on a Sunday could see her. She chooses a key from her big bunch, opens a door, and shows the treasures of the castle. Everyone is allowed to help themselves freely and deliver the young lady on condition of observing complete silence. To this day, no one has been able to avoid a cry of wonder upon discovering the treasure, breaking the spell.