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4000 years ago it was one of the biggest megacities on the planet. A place of human sacrifice and amazing art but what caused them to disappear?
New satellite imagery and cutting-edge technology, reveals the secrets of the biggest man made structure on earth; The Great Wall of China.
Marco Polo described It as one of the marvels of the world and now new technology can uncover the secrets of Kublai Khan's grand capital, Xanadu.