Chinanews, Beijing, July 26 - According to Duan Qingbo, the leader of the Qinshihuang Mausoleum Exploring Team, several piles of slates were found above the earth seal on the entrance to the tomb, which might be the traces of buildings that used to stand there.The tomb, built 2,227 years ago, is located at Lishan Mountain, 30 kilometers to the east of Xi'an, Shaanxi Province.History says that it took 700 thousand workers 12 years to build the magnificent tomb. When the project was completed, all the workers were slaughtered to keep the secret of the tomb safe.Archeologists find that there is a huge structure built under the mountain, with the shape of an inverted pyramid. The side of the square bottom of the pyramid is 5 meters, and the top of the pyramid is located 115 m deep underground.What surprises archeologists is that the ground part of the tomb, which was thought to be a hill, might have been built by workers at that time. If this is true, the ground part of the Qinshihuang Mausoleum will be the biggest pyramid-like building in the world, even bigger than the Great Pyramid of Pharao Khufu.