Back in the day, cities and towns were built with large walls as defense against savage invaders. Now, they're just very cool to see.
How was the town designed to keep invaders away? Were there moats? Drawbridges? Both?
These walls are fun to look at for their fortitude, not to mention their endurance against time.
Here are our picks for the coolest walled cities around the world. Did we miss one? Send us your photos!