It sounds like just another urban legend -- a videotape filled with nightmarish images leads to a phone call foretelling the viewer's death in exactly seven days. Newspaper reporter Rachel Keller (Naomi Watts) is skeptical of the story until four teenagers all die mysteriously exactly one week after watching just such a tape. Allowing her investigative curiosity to get the better of her, Rachel tracks down the video and watches it. Now she has just seven days to unravel the mystery.
The Ritual monument, known as a ring cairn, dates back to about 2,000 BC.
It consists of a circular bank with several small limestone standing stones on top.
Archaeologist Jon Hoyle, who found it, said it was the only site of its kind known about in Gloucestershire , and was a "very significant" discovery.Archaeologist Jon Hoyle said nobody knows precisely what ring cairns were used for
It was identified following a LiDAR (light detection and ranging) survey of The Forest of Dean.
The technique used laser beams fired from an aeroplane to create a 3D record of The Land surface, effectively removing the trees from the landscape.
Mr Hoyle said when he studied the data, he spotted an "extremely circular" feature, which he thought initially might be a World War Two gun emplacement.The Forest revealed the circular feature beneath the trees
"It was very exciting. I was expecting to find quite a lot of new sites with the LiDAR, but nothing as interesting as this. "
Mr Hoyle said ring cairns were "common in upland areas, in places like Derbyshire, Northumberland and Wales" but this was the only known one in Gloucestershire .Mr Hoyle said The Discovery was "very exciting"
"Nobody knows precisely what they were used for. Some have been found in association with burials, and often there appear to be residues of charcoal in places like this, suggesting rituals that involved fire," he added.Gloucestershire