The “Cuiyun Corridor” at Jianmen Pass is composed of 12351 ancient cypress trees, named after Qiao Bo, the magistrate of Zitong County in the third year of the Kangxi reign of the Qing Dynasty (1664), who wrote “Cuiyun Corridor, protected by green smoke”. It is centered around the historical and cultural city of Jianzhou Ancient City, radiating over 300 miles along the ancient Jianmen Shu Road in the north, south, and west, reaching Zhaohua Ancient City in the north, Langzhong in the south, and Zitong in the west. It originated in the Qin and Han dynasties and was completed in the Ming and Qing dynasties. Throughout the ages, it has been replanted to varying degrees and is a rare group of ancient roadside trees artificially planted. Even in the 20th century, this road was still considered the “living fossil of world land transportation”. There is currently no road wrapped in the depths of dense forests in the world. Cuiyun Corridor enjoys the reputation of “World Wonder” and “National Treasure”, and is a national key scenic spot, national forest park, and national key cultural relic protection unit.