Well, I just remembered this from pre-tbc,i used search and didn't find anything, proly a repost but here goes:
(Requires wall-jump skills) As you enter Catherdral district,head straight toward the cathedral and make a right,then turn left and walk back to the back wall of the district.
Make sure your not in the small section cut off from the open area, just at the back wall.
Now get up against the wall,look to the left and at angle to the wall, hit the / button next to numlock and wall-jump up to the corner. (I reccomend usin an auto-it jumping program, there are some posted on this site)
Now, carefully, turn right and jump forward. You should land on a small landing, and in front of you should be a wall that dosent completely fit with the wall behind it.
Just hop down there, and prepare for a fall. I have a rouge, and we have safe fall, so it dosent do much damage to me but idk about other classes. Like i said before, I've known this for a long while, so it's proly a repost. Maybe there's someone out there who dosent know this.