Bagua City

　　   Bagua City, also known as Huangya Zhengguan, is named after the "Bagua Street" inside the city. It was the site of government offices and storage facilities along the Great Wall. To the east lies the Ju River, and to the west rises Wangmaoding Mountain. Built following the contours of the mountainous terrain, the city has an irregular cleaver-like shape. From east to west, it consists of three parts: the barbican, the outer city, and the inner city. The eastern, western, and southern walls feature broad gates and gate towers, while the northern wall lacks gates due to defensive needs; instead, a pavilion called Beiji Pavilion was built atop the wall platform. The inner and outer city grounds are four meters apart in elevation, with one Zhenyan Gate (Array Eye Gate) at each end, north and south, allowing passage between the two sections. The streets inside the city are not laid out in a grid pattern but rather consist of dozens of dead-end alleys, through alleys, and offset T-junctions, collectively referred to as the "Bagua Streets." Walking through them gives visitors a disorienting, mysterious feeling. Restored in 1987, the city’s layout follows the eight trigrams of the Bagua: Qian, Gen, Zhen, Xun, Li, Kan, Kun, and Dui. The central "Huangya Pass Command Office" was converted into the Great Wall Museum. The Qian Trigram area houses a forest of steles engraved with calligraphy from famous generals and scholars, as well as a stele forest featuring Mao Zedong’s poetry calligraphy. The barbican hosts a hall displaying carved bamboo couplets, and the remaining buildings were repurposed into the Huangya Mountain Villa Hotel.