Introduction to Tuancheng: It was originally a small island in Taiye Pool and was part of Daning Palace in Jin Dynasty. In the Yuan Dynasty, it was called Yuandi, also known as Yingzhou. A circular city wall is built around the island. The city is 4.6 meters high and covers an area of ​​about 4,500 square meters. The palaces on Tuancheng are majestic and unique, and the pines and cypresses are vigorous and straight. In 1961, the State Council listed Tuancheng as a national key cultural relic protection unit.