First off, I don't know if this really counts as an exploit, so if it doesn't please move it. Second, I found the pic off Allakhazam after I found out how to do this, so credit goes to them for the pic.
So first, take any gnomish or goblin mail box; the Tinker Town or Gadgetzan ones work best. Get your mount and jump on to the mail box. Then, shift a little to the right or left, get the right angle and take a screenie. Should look like this;
Sorry for the small pic/ Anyway, Gadgetzan is the best candidate for this, and it makes an awesome wallpaper![]()