Hanzhong in Shaanxi Province has a splendid history and culture. To enter Hanzhong to understand its human history seems to bring you back to the era of the Han Dynasty and the Three Kingdoms, when smoke billows and horses whine. Stone Gate Trestle Road in Hanzhong. Known as "the ninth miracle of the world", the 235-kilometer-long Prairie Trestle Road is the military stronghold of communication between the north and the south in ancient times. It is often said that "Shudao is difficult, it is difficult to go to Qingtian". Since the Spring and Autumn Period and the Warring States Period, in order to cross the Qinling Mountains, the ancients drilled holes along the cliffs of the valley, with beams, columns, wooden boards and railings to form a trestle. Vehicles and horses hanging in the air, very spectacular, it started in the south of the Hanzhong Jiaogoukou, north to Meixian Xieyuguan, so it is called Jiaoqiao Trestle Road.