There are five historical gates in Taipei: the East Gate, the West Gate, the South Gate, the Small South Gate, and the North Gate. It was built by Liu Ming-chuan during the reign of Emperor Guangxu; The northern gate served as a main gate, and the northern gate castle consisted of two floors surrounded by strong walls in the form of a heavily guarded castle. Nowadays, residents and tourists visit it to contemplate its architecture and learn about its history.