Introduction to Immortal Residence: After passing the Zangtan Cave, there are stone walls forming the shape of horns. Inside the corner, there is a huge rock as flat as a bed, which the locals call the "immortal residence". Legend has it that Lü Dongbin built a 100-foot-long boat and lived here. The stone bed was where Lü Dongbin slept, and is known as the Immortal Bed.