Built in 1381 AD, as the first pass of the eastern starting point of the Great Wall, the boundary between the inside and outside the gate was an important barrier for Beijing during the Ming Dynasty. A complete and strict military defense system composed of Guancheng, Yucheng, Luocheng, Yicheng, Sencheng and Bonfire Station, Xiongguan is narrow and easy to guard and attack. Because of its unique construction, it stands out among the many dangerous passages of the Great Wall in the Ming Dynasty and is known as "the two Beijing lock keys are unparalleled, the first pass of the Great Wall."