Introduction to Tongshan Ancient City: Tongshan Ancient City was built in the 20th year of Hongwu in the Ming Dynasty. At that time, Zhu Yuanzhang, the emperor of the Ming Dynasty, sent Zhou Dexing, Marquis of Jiangxia, to inspect the southeastern coast and use granite as material to build a city and village. In the following hundreds of years, the famous anti-Japanese general Qi Jiguang and the national hero Zheng Chenggong used Tongshan Ancient City as a stronghold to defeat the invaders.