The Great Wall of China is one of the world's greatest engineering marvels, and it took dangerous, cutting-edge construction to build it. Experts use the latest tech and modern-day science to reveal if building it a second time would be as deadly. |
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Title: | Secrets at the Great Wall | |
Air Date: | August 18, 2019 | |
Runtime: | 60 min | |
random000 : What the? Why did he do that?