Maybe it is a difficult one because you can't walk around it to inspect it further. But it was actually the core (pipe) of a volcano! When the volcano cooled down, the vertical cracks started to form because the material shrinks as it cools, such as in many famous basalt columns. Because it is a harder material it doesn't erode that fast and now these columns are sticking out the landscape. They used to mine those nice, rectangular, hard rocks to make roads, that's why you see so much debris lying around 😁

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