Humans have long been obsessed with the idea that we are not alone in the universe - which is why the appearance of random metal pillars in the British countryside have sparked fresh theories over whether a third kind truly does exist.Last weekend, yet another mysterious shiny silver structure was spotted by walkers on Hay Bluff, near the town of Hay-on-Wye. It was the latest in a series of bizarre structures to crop up, with pillars also spotted on a beach in the Isle of Wight, at the top of Glastonbury Tor, in the middle of Merry Maidens stone circle in Cornwall and on the fields at Dartmoor National Park.
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