
1) Hill fort in Lancashire
Found on
https://www.crosswordclues.com/clue/castercliff

Castercliff is an Iron Age hillfort situated close to the towns of Nelson and Colne in Lancashire, Northern England. The site consists of three ramparts enclosing an oval interior. Excavations during the 1970s appear to show that the site was not completed, and no evidence of occupation was unearthed. The site is a Scheduled Ancient Monument. ...
Found on
http://en.wikipedia.org/wiki/Castercliff
No exact match found.