How The Great Wall of China Was Actually Built

The Great Wall of China is 21,196 kilometers long — and it was never one wall. From rival kingdoms pounding earth around 800 BC to Qin Shi Huang linking seven walls with 300,000 men in 221 BC, the Han's 10,000-kilometer desert line of reeds and gravel, and the Ming's brick fortress at Badaling, this documentary reveals what you're actually looking at. It explains hang tu rammed-earth building, the wolf-dung beacon telegraph, and why living biocrust now protects the wall better than restoration.