Columnar joints in igneous rocks make some of the most spectacular sites in geology, especially if you travel around Iceland. Take a look here to see some of the best from around the world.
I also like how these distinctive geological structures can get used. There are suppliers who can sort you out with columns of different sizes for your garden; they can be used as the plinth for sculptures, benches and bollards in the street, garden tables, memorials and (my own favourite) gravestones. What would you use them for?
Thanks to Rosie for sending the link.
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