There is an old mulberry tree approximately 150 years old in the village of Dinosa in Montenegro. This tree has been gushing water since the 1990's. It sits on underground streams and its hollows act as a relief valve for the pressure that builds up after heavy rainfall. More reading: https://en.wikipedia.org/wiki/Dino%C5%A1a_mulberry_tree Source of video: https://www.youtube.com/watch?v=Yo4ooRHQ3MA