'Brazilian Stonehenge' discovered

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.

It was traditionally thought that before European colonisation, the Amazon had no advanced societies.