The Ancient Waterworks is a location that appears in Wario: Master of Disguise.
The Ancient Waterworks is a very large ruins located deep in a forest. There is also a large waterfall where opening certain doors allow water to pass through.
Episode: 6: A Flower That's Drunk Up Power!
Wario and Goodstyle continue their hunt for the Wishstone pieces where the third one is stated to be located within the Ancient Waterworks. After solving the many puzzles of the large ruins, Wario defeats Ka-Bloom! at the end and obtains the third piece of the Wishstone.
Special Episode 3
Wario and Count Cannoli appear to be continuing their rivalry where they ended up in the Ancient Waterworks again. Carpaccio suddenly shows up and tells the two thieves that he needs pieces to his invention and whoever finds them first gets to have it.