For example, Genghis Khan, the founding emperor of the Yuan Dynasty, used many people to build a mausoleum for him when he died, but after the completion, the whole mausoleum was razed to the ground from above, which was basically the same peacefully. In order to facilitate the follow-up ancestor worship, they still thought of a way, that is, at the beginning of the mausoleum, kill a hungry lamb, and then rely on the lamb's mother to determine the location of the mausoleum, but after the death of the old lamb, it is basically the same.
Secondly, although the Yuan Dynasty had entered the Central Plains at that time, they did not change the habit of this burial method, and still followed the tradition handed down by Genghis Khan, adhering to the idea of returning to the grassland after death, so it is difficult for you to find the mausoleum of the Yuan Dynasty. Unless there is an earthquake in Inner Mongolia one day, their graves may be shaken out.
Not only that, but also has a lot to do with the low status of Han people at that time. At that time, the Mongols classified the Han people as third class. It can be said that the Han people basically have no right to speak, and of course it is impossible to be a big official in the court, let alone have access to such confidential information as where the emperor was buried.