Introduction to Xianyaba Plank Road: Xianyaba Plank Road is the longest-used ancient plank road in the world, located 20 kilometers east of Wudu County. The plank road is two kilometers long and is one of the three ancient plank roads on Yinping Road. It is said that the ancient road was built by Jiang Wei, a general of the Shu Han Dynasty during the Three Kingdoms period, and was erected on the cliff. The plank road changes according to the mountain topography, has various structures and is extremely steep. The most dangerous section is the "Tianzhu-style" structure. There are more than 300 meters of cliff. Because there are no columns or diagonal supports, it can only be made by drilling holes in the cliff rocks, inserting beams, and laying wooden boards. People walking on it tremble. This plank road has always been the most feared section for travelers and merchants traveling on the Yinping Ancient Road in ancient times. It is also one of the most steep and spectacular tourist attractions on the Yinping Ancient Road that combines history, culture and natural scenery.