Modern Marvels
Season 4, Episode 11: The Great Wall of China.
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Winding 6,000 kilometers through undulating mountains, it is said to be visible with the naked eye from the moon. But who called for the Great Wall's construction and how was it accomplished? Historians, engineers, and scientists explore one of the wonders of the ancient world.
All Episodes - Season 4
Episode 1
America's Highways
Episode 2
The Telephone
Episode 3
Aqueducts
Episode 4
Television
Episode 5
The Computer
Episode 6
Captured Light
Episode 7
Stealth Technology
Episode 8
Pyramids: Majesty And Mystery
Episode 9
Roller Coasters
Episode 10
Observatories: Stonehenge to Space Telescopes
Episode 11
The Great Wall of China.