In the center of Guancheng, there is a beautifully carved Chinese white jade stone platform called "Yun Terrace", which was built in the fifth year of the Yuan Dynasty (1345 AD). It was originally the foundation of a building, on which were built the Cross Street Tower and Taian Temple, but now only the constellation remains. The carving of the platform is mainly in the vaulted door and vaulted hole. The inside of the door has a vajra pestle and relief carving of various beasts, the middle of which is carved with the King of the Golden Fin. The inner wall has the relief carving of the Four Heavenly Kings and the "Dharana Sutra Mantra" and the "Record of Merit and Virtue of Pagoda Making" in Chinese, Tibetan, Hui, Mongolian, Sanskrit and Xixia 6 scripts. The top of the vaulted door is covered with relief carvings of mandala flowers and small Buddha statues, which are extremely delicate.