A line of 90 massive stone monoliths has been discovered in the U.K., buried for some 4,000 years just one mile from the famed and mysterious Stonehenge.

Researchers found the 4,500-year-old stones lined up (unlike Stonehenge's circle) three feet underground by using new radar equipment towed by quadbikes. Some of the stones reach up to 15-feet tall.

'We're looking at one of the largest stone monuments in Europe and it has been under our noses for something like 4,000 years,' said Professor Vince Gaffney, from the University of Bradford, one of the archaeologists leading the research, told the Daily Mail. 'It's truly remarkable. 

'We don't think there's anything quite like this anywhere else in the world. This is completely new and the scale is extraordinary

'We presume it to be a ritual arena of some sort. These things are theatrical… designed to impress.'