IT NEVER CEASES TO AMAZE me how much you can learn about the world from a map. After all, all maps are renderings of the same image, even if there are changes in format and scale: they are attempts at reflecting reality in an easy-to-understand way. By changing a few factors, you can make what is basically the same image say an infinite number of different things. Good maps can tell you a lot, while bad maps can help make you just a little bit dumber.
The following maps are really awesome maps that have something to teach you about the world, its politics, its history, and the people in it. Well, 20 of the maps will teach you something. The last is just incredibly, incredibly bad.