Introduction to the Double Stone Gate: The Double Stone Gate is also known as the Nuwa Stone Gate. The two sides are exactly the same in height and size. It is suspected to be a miraculous workmanship. According to legend, Nuwa's stone practice to mend the sky once set up this stone chamber and made up the remaining colorful stones. The rest of the Jia Baoyu jade are hidden in the stone chamber. Butterfly Spring is 400 meters south.