Introduction to Niu Xin Stone: Niu Xin Stone, formerly known as Hanging Stone, is located on the cliff east of Laolongtan. This stone is so huge that it hangs high in the air, shaped like a cow's heart. It protrudes from the steep cliff and is likely to fall into Laolongtan. Therefore, some people call Laolongtan the pot bay, and it can be used to cook cow's heart.