How the Great Wall of China Works

The Great Wall of China is incredibly long, and was originally built for military purposes. Check out this HowStuffWorks podcast to learn more about the Great Wall.

Learn more about advertising on the HowStuffWorks podcasts at www.howstuffworks.com/advertisers.htm

And to learn about your ad choices when listening to podcasts, visit https://www.howstuffworks.com/privacy.htm#ad-choices