Discovery means Zhou can finally be fully traced . The 6-mile stretch is thought to date back more than 2,000 years . Historical records suggested the stretch existed but physical evidence has never been found until now . China ’ s first emperor built it to stop invaders crossing the Yellow River .
Discovery means Qin Dynasty Great Wall can finally be fully traced . The 6-mile stretch is thought to date back more than 2,000 years . Historical records suggested the stretch existed but physical evidence has never been found until now . China ’ s first emperor built it to stop invaders crossing the Yellow River .