Secrets - Season 2 - Eps 7: Great Wall of China
The Great Wall of China is more than just a part of history, it's part of the world's geography, a sprawling, massive edifice of mud, reeds, and billions of bricks. But why did the Chinese go to such lengths to build it? And what secrets have enabled it to survive for over 2,000 years? We unravel its mysteries and rewrite its complex history through groundbreaking science and pioneering drone technology. This is how the wall was built, what its real purpose was, how it has survived multiple earthquakes and attacks, and how long it really runs.
About Secrets

Title: Secrets
First Air Date: 2013-08-04
Last Air Date: 2021-09-20
Status: Returning Series
Rating: 8/10 (from 1 votes)
Language: EN
Seasons: 7
Total Episodes: 45
Network: History Smithsonian Channel
Genres: Documentary, Mystery
Production Companies: Blink Films
Synopsis
A monument that may explain why the people of a thriving ancient city vanished from Earth. A tablet that reveals a towering truth about one of the Bible's strangest stories. Evidence that the 10 plagues of Egypt were real natural phenomena. Join us as we follow a team of investigators around the globe, using modern science and technology to uncover ancient mysteries surrounding these and other puzzles from our past. By examining these relics and legends, we hope to gain insights into who we are, where we come from, and where we are going.