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We’re about to go on a tour of some of the most stunning structures on the face of the Earth. They’d be a delight for any sightseer, but these structures all have something in common. They were built using techniques that scientists and archaeologists can’t explain, or for reasons they can only guess at. Is it possible that we’ve lost some of the building knowledge that our ancient ancestors took for granted? Watch this video, and make up your own mind!



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