Secret History - Season 14 Episode 4 The Great Wall of China: The Hidden Story
- Genre : Documentary
- Année : 2017
- Réalisateur : Nick London
- Acteur :
- Pays : United Kingdom
- studio : Channel 4
- With access to the first nationwide survey and state-of-the-art drones mapping the Great Wall of China, this documentary offers new evidence that reveals its extraordinary magnitude, rewrites its millennia-long history and decodes its complex signals system. Using cutting-edge chemistry, the programme also finds out what has kept the wall standing for so long - a simple cooking ingredient found in kitchens across the world.
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