By Takashi
This page which is based on the information from 'THE UNIVERSE(THE SKY)=SORA' is made by HONO who is one of the fellows of THE UNIVERSE(THE SKY)=SORA.
Mausoleum of Qin Shi Huang(China)
About BC 210 BC, 700,000 people were made to be mobilized for the tomb of Qin Shi, and the height of the mound is said to have been 115 meters at that time.
Even now, it maintains a height of about 50 meters, and the length of north and south and east and west is 300 meters or more.
A double wall was built, and, as for an outside wall, 2 km and even an inner wall have a length of 1 km or more in north and south, and underground is dug under 4 meters.
Such a surprisingly huge grave was built only with human power in this time.
https://upload.wikimedia.org/wikipedia/commons/thumb/2/22/Tomb_of_Emperor_Qin_Shi_Huang.jpg/480px-Tomb_of_Emperor_Qin_Shi_Huang.jpg
http://slicer93.mbsrv.net/88-1043.html