3-D crop circles are back in 3-D

A floor of chequered tiles stretches down a long, high-ceilinged corridor with doors leading off each side.

And the art of crop circles reaches a new height of sophistication.

The astonishing three-dimensional design, 200ft in diameter, has been created in a wheat field at Silbury Hill, Wiltshire.

Only yards away are the 5,000-year-old West Kennet Longbarrow burial grounds, one of the largest and most impressive Neolithic graves in Britain.