The great wall of China!

The great wall of China was built over 2000 years by several Chinese emperors . the first emperor Qin started to build the great wall and about one fifth of the population were involved.It was built to defend attacks from other countries.The great wall is around 6300 kilometers in length.A large number of people lost there lives building the wall of China. Qin made it because the north is defenseless but south ,east and west are armed.There is a rumor that you can see it from space. you can see the bullet holes from the last battle.