View full lesson: http://ed.ted.com/lessons/what-makes-the-great-wall-of-china-so-extraordinary-megan-campisi-and-pen-pen-chen
The Great Wall of China is a 13,000-mile dragon of earth and stone that winds its way through the countryside of China. As it turns out, the wall’s history is almost as long and serpentine as its structure. Megan Campisi and Pen-Pen Chen detail the building and subsequent decay of this massive, impressive wall.
Lesson by Megan Campisi and Pen-Pen Chen, animation by Steff Lee.