Construction on the Great Wall began in the third-century BCE under Qin Shi Huang (Shihuangdi), the first emperor of a unified China, the History Channel reports. Prior to the Qin dynasty ...

Did you know the Great Wall of China is over 21,000 kilometers long ... This was the start of a long timeline of great wall ...

Succeeding emperors and dynasties continued the construction ... The Great Wall was designed for protection, but don’t forget the forts that were another part of China’s defenses.