In Finnish we call "Hiidenkirnu". I don´t know what is it in English. But, it is the water and small or big rock made hole to the bedrock. It took thousands of the years that those holes are created by the nature. Place, is unique. It might be little bit difficult to go there if you don´t have a car. It is located in the countryside. There is good signs all over in the place. It took from the parking place to walk there about 15 min - 20 min through the Finnish forest.