Everything You Need to Know About the Great Wall of China

The Great Wall of China is the world’s longest defensive fortification.

It is not one long wall but a system of many walls built over 2,000 years.

In 220 BC, Emperor Qin Shi Huang ordered constructing the northern wall, to defend against enemies like the Mongols.

Beacon and watch towers are built to garrison troops and linked by miles of connecting wall.