On a different server I saw a plugin that generated dungeons across the map. They were huge and I could never clear one completely because it was tons of tightly packed corridors and rooms and the mobs were just relentless. You could throw down torches (although some areas torches just wouldn't make a difference), loot chests, and destroy webbing. Then every so often it would 'reset' (like once a week). As I got farther down, I started encountering rooms with lava and narrow paths across it. I never got past the floor that was a parkour thing, hopping across stones in lava, because some skeleton would always shoot me. The dungeon would only have one entrance above ground as a small cobble/mossy shack, was the only way to find the way in as the ground near the dungeons was always protected.
But I remember the server owner talking about it having a bunch of variable you could adjust such as size, what blocks it is made of, etc.
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