Looking for a good dungeon

[Luna_blade]

So I'm looking for an RPG game that is playable on the computer (no high graphics stuff like Skyrim) that has a dungeon. Not just a dungeon, but a real good dungeon that is long and fun.
The lenght or "floors" should be something like this: http://shrines.rpgclassics.com/snes/lufia2/ancientcave.shtml or this:http://finalfantasy.wikia.com/wiki/True_Moon.
I'm also looking for something more medieval (wow another requirement? :D), so no Urban RPG or Sci-Fi. Not such a big problem perhaps.

If any of you know such a game, let me know.