Secret History

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

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.

Genre:

Documentary

Seasons:

17

Episodes:

117

Quality:

HD

Status:

Returning Series

First Air:

1991

IMDb:

8.5