Secret History - Season 14 Episode 4 The Great Wall of China: The Hidden Story

Secret History
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.
TitleSecret History - Season 14 Episode 4 The Great Wall of China: The Hidden Story
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First Air DateNov 14, 1991
Last Air dateNov 12, 2017
Season17 Season
Episode117 Episode
Runtime26:14 minutes
QualityHD
IMDb: 7.00/ 10 by 1.00 users
Popularity11.983
LanguageEnglish

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