I learned about a great series of geography games from Good Experience. It’s called the Traveler IQ Challenge (and appears to sponsored by Travel Pod), and they’re different from any other geography games I’ve seen on the Internet.
You’re given a location, you click where you think it is, and you get points depending on how close you are from its accurate location.
This description, however, doesn’t get near to giving justice to the games. Just check them out and you’ll see what I mean.