Rocks like cheese
Tafoni are one of the specialty of Finnish nature. From the right angle the rocks with tafoni formations may look like your average boulders but if you look closer, you find that their insides are full of holes resembling Swiss cheese. The holes, so big that even a human could go through them, are quite an incredible sight – becoming ever more so as the holes keep expanding due to humidity, frost and heat as time goes by.
Some of the greatest tafonis can be found at Karhunpesäkivi in Inari and at Pirenpesä in Nokia.