Great Wall of China Historical Timeline

Origins

The earliest sections date to around the 7th century BC, when individual Chinese states built separate defensive walls facing north, long before any single wall connected them. These early walls were built mostly of rammed earth, a technique that shaped Chinese wall-building for centuries afterward.

Turning points

When Qin Shi Huang unified China's warring states in 221 BC to found the Qin dynasty, he ordered existing regional walls connected and extended into a single defensive line against nomadic incursions from the north -- the first true "great wall," built at enormous human cost under forced labor. Successive dynasties, particularly the Han, extended and maintained the wall further. Its most significant transformation came under the Ming dynasty (1368-1644), which rebuilt vast sections in brick and stone rather than earth, added the watchtowers and garrison fortifications most visible today, and pushed the wall's total length to its historical maximum.

Influential people

Qin Shi Huang, China's first emperor, ordered the original connected wall built, framing it as a matter of national defense and expressing his authority over a newly unified China in the same stroke. The unnamed conscripted laborers, soldiers, and prisoners who built and rebuilt it over two millennia -- a labor force so vast, and a toll so severe, that the wall is sometimes called "the longest cemetery in the world" -- shaped it far more directly than any single ruler.

Cultural evolution

The wall's purpose shifted with China's own political geography -- a defensive barrier against Mongol and other steppe incursions during the Ming dynasty, it became instead a national symbol after China's dynastic era ended, adopted as shorthand for Chinese civilization and endurance itself. Sections closest to Beijing, like Badaling, were the first restored for public visitors in the 20th century, beginning the wall's transition from military ruin to the country's most recognized tourist landmark.

Present-day significance

The wall became a UNESCO World Heritage Site in 1987. A 2012 Chinese government archaeological survey measured the combined length of every wall section built across all dynasties, including natural barriers incorporated into the defensive line, at over 21,000 kilometers (13,000 miles) -- far beyond the Ming-era wall alone. Large stretches remain unrestored and are actively eroding, even as the best-preserved sections draw millions of visitors a year.