I just saw the thread about the Abyssal Maw raid/dungeon that was never implemented. That got me thinking of all the instance portals that were added to the game but never used. I was wondering what portals exist that I don't know about.
List of locations with unused instance portals:
Wintersrping - unsued Mount Hyjal portal. I'm not sure if this is still there or was done away with in the Cataclysm.
What other unused portals am I missing?