As one of the earliest fortresses built during the Spring and Autumn Period, the Hanguguan Pass stands between Luoyang to the east and Xian to the west. Its strategic importance has made it a bone of contention amongst militarists. For thousands of years, it has remained a stratetic stronghold.
The Pass is the birthplace of Taoism, where Laozi completed the Tao Te Ching, and a hub that connects Chang'an and Luoyang. It is where the Culture of central China converge with the culture of Shaanxi provinces. Laozi was a profound thinker, great statesman, philosopher and writer of the late Spring and Autumn Period. The Tao Te Ching, his magnus opus, is a treasure in world literature. Since its first publication, a research craze has swept the country amongst the emperors and officials throughout China. The impact can be felt overseas in the 7th century with a Sanskrit version, and even spread to Europe and America in the 18th century.