Purple aura arrives from the east at Hangu Pass

Hangu Pass is the earliest established key fortress in Chinese history, once a battlefield where war horses neighed, and now its main attractions include Taichu Palace, Jiming Platform, Guanlou, Hangu Ancient Path, and more than 20 other sites. It is also a sacred place for Taoism because Laozi wrote the "Tao Te Ching" here, and it is the origin of historical stories and legends such as the purple aura coming from the east and the crowing of chickens at Hangu Pass.