Introduction to Fengtian Chengyun: Particularly worth mentioning in the "Fengtian Chengyun" exhibition room are the largest imperial edicts in the Ming Dynasty in the fourth year of Apocalypse, the imperial edicts in the sixth year of Apocalypse, and the hand-painted dragon edges in the sixth year of Xianfeng in the Qing Dynasty. Imperial edicts, as well as imperial edicts from Vietnam, Japan, and Korea, are also rare and extremely precious.