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The Great Wall of China is the biggest man-made structure on the planet – and one of its biggest mysteries. Follow the scientific mission to reveal the ancient secrets of one of history's greatest empires. (Science Channel)
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Photo © Discovery Networks
![Unearthed - Ghosts of the Great Wall - Photos](http://image.pmgstatic.com/cache/resized/w663/files/images/film/photos/161/443/161443527_98f5ec.jpg)