Felsenmeer Hemer
A whim of nature? Also that, yes. The woodland covered in moss and lichen with its jumbled rocks – otherwise called conical karst formation – is like a precious window into the distant Tertiary period. But in addition, the area is teeming with shafts and tunnels that generations of miners cut deep into the earth – at a time when the Ruhr area still had cows grazing its pastures …