I found a neat little trick that will allow you to climb up any mountainous type of area. (It cannot be a straight 90 degree wall). It's helpful in some cases, especially for range users in Stormwind.
Steps:
Step1: Die. Simple enough.
Step2. Before you click on "Release Spirit" press Esc and click on 'Logout.'
Step3: Right after you click on 'Logout' click 'Release Spirit.'
Step4: Now that you're in ghost form, you should be able to walk around even though you are logging out. With this you can walk up any angled wall that isn't 90 degrees.
Step5: Once you reach your area, or by the time the 20 seconds is up, click 'Cancel' on the Logout so you do not actually log out. You can if you want, but it's a waste of time to re-log.
Downsides:
--20 second limit.
--The area you want to scale has to be near a spirit healer.
--You must die near that spirit healer so once you do reach your destination you can res. and be up there, where ever it may be.
I found this on my own, if it is a repost I apologize.
Credits go to me for finding and posting, again, unless this is a repost.