BBC Genghis Khan documentary: https://www.youtube.com/watch?v=htEXmRHjf5s
The Great Wall: https://www.youtube.com/watch?v=RyHJCWfQYwo
Terra Cotta Warriors: https://www.youtube.com/watch?v=RsUE-ZtcUFg
More Terra Cotta Warriors: https://www.youtube.com/watch?v=LAPRJVeiDbQ