Construction Secrets of the Original Great Wall

UNEARTHED http://www.sciencechannelgo.com The first Great Wall was built from mud and reeds over 2,000 years ago. As warfare developed, the wall had to be improved and strengthened. Watch full episodes of your favorite Science shows: http://www.sciencechannelgo.com Subscribe to Science Channel: http://bit.ly/SubscribeScience Follow Science Twitter: https://twitter.com/ScienceChannel Or join us on Facebook: https://www.facebook.com/ScienceChannel Check out the all new seeeker.com: http://www.seeker.com/