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2. Stonehenge – A Monument of riddle
Stonehenge is one of the most notorious ancient structures in the world, but how it was erected remains a riddle. Constructed between 3,000 and 2,000 BC, this massive ring of monuments is believed to be a burial point, but no bone knows for sure. Each gravestone is about 13 bases altitudinous and weighs 25 tons — without ultramodern ministry, how did people move them into place? The answer is still unknown.