This trick requires a mount, but it MIGHT work without one if you're a good jumper. It is also very hard to do as alliance as it's in a horde town
Head in to Hammerfall, the horde town in Arathi, and get on to the large platform outside the inn, with Drum Fel etc. on it. Then stand in the inn doorway and face out across the town. Head to the far left corner of the platform and mount up. It is then a simple matter of jumping onto the long building that you can see from there.