If you want an in­sight into the past... SE­CRET HIS­TORY

Sun­day, 8pm, Ch4

The Irish Mail on Sunday - TV Week - - SEVEN DAYS -

This fas­ci­nat­ing doc­u­men­tary sets out to solve some of the mys­ter­ies sur­round­ing the Great Wall of China. How long is it re­ally? Why was it built? How has it sur­vived so long? Us­ing state-of-the-art drones and some cut­ting-edge chem­istry, it comes up with in­ter­est­ing an­swers.

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