According to what I've read, the inside of the tomb has like a miniature scale "map" of the "world" according to what they thought it was then. All the rivers and lakes supposedly are mercury - which I tend to believe, as modern scans of the land show a very very high mercury level on that site. According to legend, the ceiling is like a map of the night sky, and the stars and planets are represented by different sized pearls. There is supposed to be representations of servants, guards etc, which I am thinking are probably figures like the terra cotta warriors. Although this stuff just comes from old legends, the things they have found so far support the legends, so it might just all be true...