Valve has been keeping track of the people currently playing the beta for Counter Strike: Global Offensive. Not just who's winning and who's losing, but really interesting stuff, like where everyone is standing when they pull the trigger.
The result of that kind of data-tracking is this glorious map (of de_train), showing exactly where players were when they decided to up and shoot somebody. As you can see, some spots are relatively tranquil. Others, well, they're battlegrounds. Or, to be more correct, since this is tracking where people were standing, campsites.