It has been called the world's first skyscraper. 11,000 years ago, a society of hunter-gatherers built an 8-metre tall tower and staircase out of stone - for apparently no reason. Ever since it was discovered, the Tower of Jericho has puzzled archaeologists. Some have suggested that it was built as a watchtower, but there's no evidence of any invasions. Instead, the tower might have been a way for the first villagers to bond.
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