It may sound like an idea straight out of a C.S. Lewis manuscript, but the story of the Tuscan medieval village of Fabbriche di Careggine is absolutely not a piece of fantastical fiction.
In 1946, Fabbriche di Careggine was flooded when Italian energy company Enel built an artificial reservoir as part of a hydroelectric dam. The inhabitants were relocated to nearby Vagli di Sotto, leaving behind their homes, a cemetery, a church, and more. The entire 12th-century village is currently 230 feet under the surface of the reservoir, Lago di Vagli.