Stonehenge and crop circle. Aerial photograph of the prehistoric standing stones site of Stonehenge (upper left) and a crop formation (lower right) in a rapeseed field. Also called crop circles,these formations are patterns of flattened plants in crops such as wheat,barley,rye,maize or rapeseed. They started appearing frequently in the mid-1980s in south-west England. Initially unexplained,they are now known to be made by humans. Stonehenge,located in Wiltshire,UK,was also constructed by humans,and dates to around 2000 BC. Photographed in September 2009 |