Published by Judges Guild.

Purchase PDF at RPGNow. (Sadly, not the original but a remake aimed at 3.x)

Reviews

So why is the Caverns of Thracia my favourite dungeon? Well, the background, setting, and encounters are all superb. Thracian presents some truly classic set-piece encounters, such as the fire-breathing greek statue that relentlessly pursues PCs who steal gems, to the tentacled beast that drags intruders into the underground river, to the palace itself, where magic-using minotaurs lead an army of gnolls and cunning dog-men. And (unusually for its time) it all hangs together perfectly. This isn't a monster motel. Everything in the dungeon - the revived shrine to Thanatos, the forgotten tombs, the lizard-man encampment, the beastmen living in an ancient temple - makes sense.

Read the Full Review at Dragonsfoot

The Caverns of Thracia by Paul Jaquays is a good example of why Judges Guild is remembered so fondly by so many of us who started gaming in the 70s. Published in 1979, Thracia is both a large dungeon and a campaign setting in its own right. While perhaps not large enough to be called a true "megadungeon," the four levels of the caverns are nevertheless expansive and filled with a wide variety of humanoid factions -- a few of them mutually antagonistic -- which contributes greatly to the feeling of dynamism the module evokes.

Read the Full Retrospective/Review at Grognardia.