Amaurot before it was already blown to smithereens. As in engaging some of the beasts before the Armageddon that happened in the streets or so.
Qitana Revel when it was in its prime and not the den of sin easters and ancient traps we got. (I'd settle for more Ronkan Empire theme'd dungeons as well)
Sohr Khai to aid in building relations with some dravanians(Like controlled sparring matches and the like akin to hullbreaker hard)
Antitower because I feel like there is still more to that dungeon than we got to see.
Skalla to further unveil the atrocities and forbidden means the King of Terror unleashed upon his people OR as listed above, the city back in its former glory.