Medusa
According to a brochure I found lying around somewhere, this carved Medusa head was removed from its original location and placed here, in what could only be called the back end of nowhere, in some strange act of revenge. The end result was that a lot of people started blaming everything that went wrong on the cursed Medusa inside the water supply. . . long story short: there are a few surefire way to anger the gods and putting them upside down in a water tank is one of them.