2012 The Great Wall - Map showing the Badaling Section Clarification / adopted 2012 The Great Wall - Map showing the Shanhaiguan section Clarification / adopted 2012 The Great Wall - Map showing the ...

In c. 220 B.C., under Qin Shi Huang, sections of earlier fortifications were joined together to form a united defence system against invasions from the north. Construction continued up to the Ming ...