There have been human activities in Huangshan since ancient times, and there is no historical record of the tomb. Your dream is not a reality, but a reflection of your inner pressure. During daytime activities, you feel the majesty of Huangshan Mountain, and the visual impact casts a shadow on the subconscious. At the same time, in real life, you feel uneasy under the surface calm, and you doubt the stability of the status quo. When the two are combined, it is very likely that the dream you see will appear in your dream. This shows that you have a high sensitivity to beauty and a keen sense of being prepared for danger in times of peace, and other aspects are not shown in your dreams.
Dreams are usually projections of realistic pressures and psychological conditions, and these projections are sometimes distorted.
Besides, you mentioned that you have always had a good impression on this city. Perhaps the unknown dangers you feel come from aspects of daily life that are particularly calm and easily overlooked, such as your health that you haven't checked for a long time, or your company's finances that you haven't checked for a long time.