I don't know if anybody have seen that before. I searched the forums and youtube thoroughly but couldn't find anything related.
I hung around in Heart of Fear when I discovered a small hole in the ground.
This is how I got out of the dungeon: http://www.ownedcore.com/forums/worl...ploration.html
(As druid you can get behind the instance portal with blink, I think mage can do the same.)
There's the hole:
You can simply place a darkmoon tiger or blink to get past there.
I jumped down and used goblin glider to see the terrain from below. Then I realised that there's something right underneath the dungeon.
Unfortunately you can't get there. You can bypass the disconnect walls in offline mode but there's a death zone a bit further down so your camera remains at the same position while your character keeps falling and you won't see a thing.
However, I captured a few screenshots of the building with the Machinima/Free Far Sight tool.
(http://www.ownedcore.com/forums/worl...reachable.html)
Not sure what it is exactly or why it's there.
It's not in uninstanced Dread Wastes though.