I have no idea if this is new or just totally ancient, I thought I'd just post it anyway.
Friend of mine told me this: If you happen to be a mage, head to the Deadmines. Instead of walking into the instance, port behind it (not sure what it's called with mages). You won't enter the dungeon but actually end up behind the gate. You can walk on, eventually fall (use feather/fly/whatever it's called) and land on a large plane, to find some random objects left behind by the devs.
Kill me if it's well-known or doesn't work anymore