Ok, this is my first real post after reading others exploration and exploits and the first time i've found something worth posting that others haven't found (yes I bothered to use the search function)
Well, you can get to this spot (URL)
Then use unstuck or blink
Then you can jump down, blink, iceblock, bubble, slowfall or any items you may have to stop urself dieing from falldmg
Now, your here, you may be thinking what does this mean? Jack Shit, but your in a place your not supposed to be in, I highly advise not dieing, it ports you to XR with your corpse in HFR, I did it, its not cool.
Also if you fall you can get back up just south-south-west of Honor Hold
Well, good way to explore shit in Hellfire (not that you'd need to) and has no NPCs but it fits around 2/3 of it, including both towns Honor Hold and Thrallmar.
You can get under the instance and look up.
Here is the end of the world.....