Transporting us back to those tumultuous times, Dajingmen silently narrates the story of Zhangjiakou as an important ancient border town. As one of the many passes on the Great Wall, Dajingmen has not only witnessed the prosperity of countless merchants traveling to and fro but also bears the heroic history of resisting foreign aggression and defending the homeland. Standing beneath the city gate, one can almost hear the echoes of history and feel the heavy sense of responsibility and mission.