The lake is called Lake Reschen and it is the largest lake in the province of South Tyrol, Italy. Iin 1940, the village of Graun was not able to stop a proposed artificial lake from being built in order to support a hydroelectric dam.
Due to the war, the dam wasn't finished until 1950. When it was finished, they had created a lake that was 72 ft deep and unified two other natural lakes in the area. The consequence was that 163 homes, and 523 hectares of cultivated land were lost! The most fascinating part about this is that you can still see the highest point of the town (a church tower) in the middle of the lake. You can even walk to it during the winter!