Introduction to the main hall: In the main hall of the old castle, there is a plaque of "Yiwen Xuanzhao" inscribed by the President of the Beiyang Government in March of the 13th year of the Republic of China (1924) and presented to Wang Tangxuan, who had contributed to the road construction. This plaque was used during the Cultural Revolution The villagers hid it and only saw it again after the Cultural Revolution.