What about
Baldur's Gate: Enhanced Edition
The Heretic series (you need a Doom port like ZDoom to run, and it's more of an FPS than dungeon crawler, but whatever)
As quite a few other people said above me, Legend of Grimrock is probably the preferable choice these days, but these classics are still really fun.
Also is there any way to play the original Elder Scrolls on the Mac?
Baldurs Gate enhanced is so bugged I would not even consider it.
Your better off playing the old original version under a Wineskin wrapper.