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Brazilian archaeologists have found an ancient stone structure in a remote corner of the Amazon that may cast new light on the region's past.
The site, thought to be an observatory or place of worship, pre-dates European colonisation and is said to suggest a sophisticated knowledge of astronomy.
Its appearance is being compared to the English site of Stonehenge.
The stones appear to have been laid out to help pinpoint the winter solstice, when the sun is at its lowest in the sky.
Link to BBC