Halls of Giants (3e)
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An ancient ruined keep¸ surrounded by a stream of water¸ stands before the entrance of the Halls of Giants. This oversized underground complex goes deep in the belly of the earth. The first level belongs mainly to guards and warriors but features a temple area too. Going deeper to level two¸ the chieftains' rooms are found. On the third level¸ a mining complex surrounds a great rift. A great staircase has been built over the rift at this level. The fourth level is under construction¸ dug all around the great rift.
"You can place this dungeon just about anywhere. It could be inhabited by many kinds of giants¸ mainly those who dwell in rocky areas. The entrance could be on top of a mountain¸ on a rocky hill or in plain ground.