Requirements: Puzzle #4, Level 3 Engineering, Level 3 Culture
Action: Drop your villagers on the vines below the dam (number 3). They will scrape off the vines and, after a long while, reveal the ancient mosaic.
Description: "Being the skilled explorers, engineers, and culturists they are, your villagers expertly restored the Ancient Mosaic. It was probably the floor of an important building, judging by its intricate beauty."