Excavations at the mound at Skipsea Castle, near Bridlington in East Yorkshire, United Kingdom, where a Norman castle was located, revealed an even older, untouched earthwork, dated to the Iron Age.
The Norman motte and bailey dated from 1086 was set on a site that was used 2500 years ago in the Iron Age. Recent excavations revealed that soil from its core can be dated to 5th century BC. Further research is planned, to establish the function of the site.
(after BBC News)