The Caves of Moreau County is an adventure module for Labyrinth Lord. The various sections of this dungeon are random and modularÑthere is no mandated way for them to fit together. You can generate the actual structure of the dungeon before you play, or do it during the game, partly in response to the players' decisions.
The dungeon consists primarily of beastmen in caves with a few twists and buried secrets. It is a fairly dark adventure, written from the perspective of murderhobo PCs. It's gritty, horror-saturated old school fantasy, in case that is or isn't your bag. Or just check it out for yourself, since the PDF is available for free at DriveThruRPG.