Bullgrit
Adventurer
What are the published persistent mega-dungeons? (Let's also distinquish between official and unofficial.)
The Ruins of Undermountain, 1991
World's Largest Dungeon, 2004
Things like the various giant lairs (G1-3) aren't really big enough, nor are they really intended for multiple delvings (after completing the adventure missions). And Castle Greyhawk, though legendary, was never really published.
At first, I put Temple of Elemental Evil in this category, but thinking more about it, it's probably more like the G series -- meant for a one time through (even if completion requires many assaults).
That's all that sits on the top of my brain, right now.
Bullgrit
The Ruins of Undermountain, 1991
World's Largest Dungeon, 2004
Things like the various giant lairs (G1-3) aren't really big enough, nor are they really intended for multiple delvings (after completing the adventure missions). And Castle Greyhawk, though legendary, was never really published.
At first, I put Temple of Elemental Evil in this category, but thinking more about it, it's probably more like the G series -- meant for a one time through (even if completion requires many assaults).
That's all that sits on the top of my brain, right now.
Bullgrit