Although not immediately obvious, Zhèngdìng was once a walled city. These days much of what remains of its 24km-long city wall is just an earthen mound, but at the southern end of Yanzhao Nandajie is Chánglè Gate, commonly called Nán Mén (South Gate), which has been rebuilt to give you some idea of the city wall's former magnificence.

The original wall (which dates back to the Northern Zhou; 557 to 581 AD) was made up of an outer wall (yuèchéng) and an inner wall (nèichéng), with curtain walls (wèngchéng). The gate was closed for massive renovations on our last visit, but should reopen soon.