There are generally several ways to find ancient tombs. First, look at Feng Shui. Ancient and modern princes buried many of their prime ministers in Feng Shui treasures, such as Mang Mountain in Luoyang, facing the Yellow River and backed by mountains. Second, read ancient books. Clues of the emperor's tomb can be found in many ancient books and unofficial histories. Third, listen to legends. Many legends spread by the older generation are not necessarily groundless. Fourth, listen to the wind and thunder (the highest state).