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It's more than 2,000 years old, but the Great Wall of China remains one of the great wonders of the world, an engineering feat rarely matched in the 22 centuries since its construction began. Stretching 4,500 miles, from the mountains of Korea to the Gobi Desert, it was first built to protect an ancient Chinese empire from tribes from the north. But it evolved into something far greater - a boon to trade and prosperity and ultimately a symbol of Chinese ingenuity and will. The truth is, though, that the Great Wall is actually a series of walls built and rebuilt by different dynasties over 2,000 years. And while they often served the same purpose, these walls reflected the worlds - both natural and cultural - in which they were erected. For all its seeming timelessness, the Great Wall is an emblem of China's evolution.
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