Did the Great Wall of China Actually Keep Invaders Out?

The wall spans thousands of miles, a formidable barrier to enemy troops. But it wasn’t always as effective as its builders may have wished.

The Sui, Tang and Song Dynasties

Fun facts about the Great Wall of China

The Great Wall (Wanli Changcheng) is one of mankind's greatest

How the Great Wall of China Works

Fun facts about the Great Wall of China

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How the Great Wall of China Works