Introduction to Yunnan Ladder: Yunnan Ladder, also known as Yunnan Cave, was named after the Yunnan people dug a 79-step stone ladder 73 meters long and more than 1 meter wide on the cliff more than 600 years ago and 21 mine tunnels. . According to historical records, in the early years of the Ming Dynasty, a Yunnan man named Ma learned that Wanshan produced cinnabar. He bid farewell to his parents, wife and children, took a few followers with him, and traveled thousands of miles across the mountains to Wanshan. He found a place in Wanshan. After discovering cinnabar ore seedlings on the cliffs, they dug stones to build roads on the steep rock walls. A total of 79 stone steps and 21 mine tunnels were dug out before and after. A huge mining pillar at the mouth of the cave and the mountain form a unique landscape, resembling a huge elephant trunk.