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A number of stacks built whilst on holiday, mostly on the coast in Devon and Cornwall but also in Sicily and the Aeolian Islands, (Spot Stromboli in the background) and also the Azores. There is one built of cinders at 1500m on Etna. None are very big, the tallest, built at Southerndown in South Wales, reached about 2 meters. All are precariously balanced and I knock them down after taking the photo.