You’ve never seen a map like this. Unless you’ve seen this map. Then you’ll know exactly what it is we’re talking about, because you’ve already seen it. But you’ll look again anyway. That’s how cool it is.
If you click it, you’ll see a much larger (and easier to read) version of the 5-foot long, 4000 year history of every major event on earth during that time. (If you see a small version, hover over it with the mouse and click – it should get bigger.) The map comes to us via slate and was created by John B. Sparks, first printed by Rand McNally in 1931. It is still available for sale, but it is pretty expensive. Enjoy.