A couple of years ago I visited one of the largest limestone caves in Finland, the Torhola cave. Even though it is relatively hard to reach the deeper parts of the cave, it has a lot of signs of human activity. In addition to all the butterfly wings left by feeding bats, a lot of parts of corroding metal and candles have been left behind. The most interesting trace of human activity are the modern rock paintings which include handprints and depictions of humans and possibly some sort of animals.

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