BBC News wrote:The largest Iron Age earthwork in Britain has been identified at the former site of a Norman castle.
The mound at Skipsea Castle in East Yorkshire is 278ft (85m) in diameter and 42ft (13m) high.
It was thought to be part of a Norman motte and bailey dating from 1086 but archaeological analysis of soil from its core showed it is 2,500 years old.
Dr Jim Leary, from the University of Reading, said: "We have a pristine, untouched, Iron Age monument".
Full report HERE.
Sounds like a good candidate for a dowsing trip?