Megadungeons are (often large) dungeon complexes which are the focus of at least part of a campaign.

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How can I make “Empty” rooms interesting?

Traditional advice for making megadungeons in older versions of D&D is in addition to any rooms with Monsters, Treasure, Traps, or "Tricks", there should also be at least 50 to 60 percent "Empty" ...
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Are there any megadungeons available for non-D&D systems?

I have an abiding love of the megadungeon (defined here as a many-leveled dungeon large enough to be used as the centrepiece of a lengthy campaign), but I'm not always in the mood for one of the many ...