Legend has it that in those days, Wu Zetian chose a geomantic treasure for her mausoleum. Yuan Tiangang, the warlock, was sent to tour the world first, and he chose a good place. When Yuan Tiangang arrived in Ganxian County, he found Liangshan, a treasure trove of geomantic omen, so he threw a copper coin as a mark. Later, Wu Zetian sent Li to find it, and Li also chose Liangshan, Ganxian County, and dropped a bronze nail. As a result, the copper nail was inserted in the square hole of the copper coin. Judging from this legend alone, Liangshan is indeed a treasure trove of geomantic omen.
The first person who stole Ganling was Huang Chao, the leader of the peasant uprising army in the late Tang Dynasty. Huang Chao's 400,000 troops almost razed Liangshan to the ground, and they didn't find the entrance to the pyramid-shaped mound, leaving only a 40-meter-deep "Huang Chao ditch". The second basis is Wen Tao in the late Tang Dynasty. Wen Tao has rich experience in robbing tombs, and once stole 17 tombs of Tang emperors. But I missed in Ganling. It is said that during the grave robbery in Wen Tao, Ganling was tottering, and when Wen Tao's army withdrew, Ganling immediately calmed down. Finally, Wen Tao also left. If Huang Chao and Wen Tao are in the age of cold weapons, their weapons are not advanced. However, during the Republic of China, the warlord Sun Lianzhong and his men failed to open Ganling with artillery and explosives. Even in the process of robbing a tomb, strange phenomena such as flying sand and stones and tornadoes appeared.
Legend is a legend after all. The real reason is that Ganling is too strong and the entrance to the tomb has never been found.