Introduction to Guangyi Gate: Qida Castle was built in the first year of Chongzhen in the Ming Dynasty (1628). It was built by the villagers to prevent Japanese pirates from circling the village. The castle is oval in plan, and the city wall is 3 kilometers long and made of random stones. The original village was surrounded by ancient city walls. The ancient city originally had four gates, but now only three remain, all of which are arches made of stone. Most of the city walls have been damaged. The south gate "Guangyi Gate" is 2.16 meters wide, 2.16 meters high and 1.1 meters deep.