So a few years ago I remember there was that mod The Deep which pretty much became abandoned once Skyrim was announced. At the time the mod that had the most stuff to do and explore was I think called Frostcrag reborn which created a huge cavern underground that took forever to get through. Has anything as big as that come out in the last 3 years? Looking for stuff to add to my new install now that I have a system that will play the game without crashing all the time.

I think this is considered one of the largest dungeon mods out there: Adense Epic Dungeon: http://www.nexusmods.com/oblivion/mods/27520/?

Also, Dungeons of Ivellon: http://www.nexusmods.com/oblivion/mods/13714/?