There are huge boulders in Rimmilä in the village of Kalvola, on the edge of Peurasuo. The boulders form caves of different sizes. The site can be reached along a forest road and forest paths. The name of the Stålberg stones comes from the man who hid in them. The boulders are located on the edge of the bog Peurasuo that has remained exceptionally natural and is part of the national mire protection program.