The chamber, which is 30 meters long and 8 meters wide, also features a narrow aisle leading to a main dome next to the pyramid. / VCG Photo

People in charge of the grave excavation said though cemeteries from the Han Dynasty (202-220 BC) abound in the nearby areas, the age of this one is still to be determined. / VCG Photo

Who was buried inside the mausoleum, as well as the reason why it was built in the shape of a pyramid, are also under investigation. / VCG Photo