Strange Beehives Are Grim Reminder of Massacred Empire

The Tangut people of Western Xia were brutally destroyed by Genghis Khan. Why are these beehive structures all that remain of this civilization? WHAT ON EARTH? Tuesdays 9/8c on Science http://www.sciencechannel.com/tv-shows/what-on-earth/ Subscribe to Science Channel: http://bit.ly/SubscribeScience Check out SCI2 for infinitely awesome science videos. Every day. http://bit.ly/SCI2YT Download the TestTube app: http://testu.be/1ndmmMq