Introduction to Ersheng Palace: Ersheng Palace, also known as Ershengtang, is a Taoist temple site built in the Yuan Dynasty and located about 1,000 meters northeast of the Maogu'an site. The two-story buildings are built with long dragon boulders 1 meter long, 0.43 meters wide and 0.34 meters high. The Taoist temple was a scenic spot in the Tang Dynasty. It reached its peak in the Yuan Dynasty and was named after it worshiped Confucius and Laozi. There are more than ten relics such as the Ersheng Hall, the Sanqing Hall, the Jade Emperor Pavilion, and the Jiu Mu Hall. There are many calligraphy treasures left by literati and poets of the past dynasties. Among them, the famous ones include more than 20 stone carvings with scenery and poems, such as "Bamboo Creek Scenic Spot", "Pole Rock", "Yan Yizhai" and "Guan Tao". During the Kaiyuan period of Tang Dynasty, Li Bai and other "Liu Yi of Zhuxi" used to sing and drink here, recite poems and compose rhymes. Lu Sen and Xu Heng lived here in seclusion during the Yuan Dynasty. In the Qing Dynasty, Zhao Guolin visited the Ersheng Palace and left detailed notes. It is a key cultural relic protection unit at the municipal level. During the Kangxi period of the Qing Dynasty, Lin Hangxue, the prefect of Tai'an, once wrote a poem praising: "The fall in front of Duxiu Peak is red, and the thousands of rocks are rustling in the evening wind. The branches of the bamboo stream are covered with mist, and the reflection of the Xia Tower in Songhai is empty. The green pines in the stone stream are bright and green, and the golden friends are green. There is nothing wrong with it. The two gentlemen went to the ancestral hall and left a spiritual light on Ludong."