UNIQUE? Not that many actually.dont get me wrong, I like MoP, but ffs, look at how many UNIQUE dungeons BC had.
1 Dungeon for hellfire, the other 2 used the same aesthetic. + Raid with same.
1 Dungeon for Zangarmarsh, the other 2 used the same aesthetic. + Raid with same.
1 Dungeon for Auchindoun, the other 3 used the same aesthetic.
1 Dungeon for Tempest Keep, the other 2 used the same aesthetic. + Raid with same.
If you're looking for unique art, BC is not the dungeon xpac you should be looking at.