Hi, the Great Wall was built to stop the invasion from the northern nomadic tribes in ancient China. It passes ten cities and provinces in north China. It is the biggest manmade project in the world and the no.1 scenic attraction in China. This is all what I know.

Well when the emporer Qin was in rule he would punish people who did wrong by making them work on the great wall of china until the workers died or until the wall was done.