Introduction to Shuang Tomb City: Shuang Tomb City is the biggest feature of Xianling Mausoleum. The two tombs represent the dual identities of the owner of the tomb, the vassal king and the emperor. This tomb city was first built for King Xingxian in the 14th year of Zhengde. After Emperor Jiajing ascended the throne, he planned to move his father's tomb to Beijing, but was dissuaded by the ministers. In the 18th year of Jiajing, his mother, the Empress Dowager Zhangsheng, died of illness in Beijing. Emperor Jiajing When his parents were buried together, a new Xuan Palace was built as a tomb city, forming a unique and unique landscape of one mausoleum and two tombs among the tombs of emperors in ancient and modern times, both at home and abroad.