The Great Wall of China Episode

12/29/2015, 2:00:00 PM , duration(0:0:2)
Society & Culture
The Great Wall of China is one of the most visited tourist desinations in the world. How'd it get built? How old is it? What's the current condition? Learn this and more in today's episode.<br><br> Learn more about your ad-choices at <a href=''></a>