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.)