Destination Unknown is a very slick online geography game using Instagram photos. It’s particularly good because it offers hints. Unfortunately, since it utilizes Instagram, there’s probably no guarantee that all the photos will be classroom appropriate, though I didn’t see anything bad when I played the game.
Because of that potential issue, and because it may not be around for the long-term (since it’s sponsored as a promotion by a company), I’m not going to add it to The Best Online Geography Games. But it still might be worth a visit.