This less-visited attraction was surprisingly quiet, with fewer tourists than expected. It is the most complete existing T-shaped stone-built ancient city in China. Surrounded by the sea on three sides, it was a strategic location for coastal defense during the Ming Dynasty.
- Construction began in the 20th year of the Hongwu reign (1387): commissioned by Zhou Dexing, Marquis of Jiangxia, to defend against Japanese pirates.
- Military defense system: The ancient city has a trapezoidal plan, with a perimeter of approximately 2467 meters. The city walls are 7 meters high and 5 meters thick, with four gates (east, south, west, and north). Three sides are fortified with barbicans, and it is equipped with beacon towers, horse tracks, and arrow slits.
- Multiple renovations: It underwent renovations during the Jiajing reign of the Ming Dynasty and the Kangxi reign of the Qing Dynasty.