The Devil's Cave is a natural karst cave near the Upper Franconian town of Pottenstein in the Bayreuth district in Bavaria. The stalactite cave is the largest of the approximately 1000 caves in Franconian Switzerland. It has rich stalactite decoration with stately stalagmites and stalactites and is considered one of the most beautiful show caves in Germany. The cave entrance, a 25 meter wide and 14 meter high portal, one of the largest cave entrances in Germany.