Cruise Back Fell was the site of an Iron Age hill fort. It would originally have been a large and impressive defensive structure on the summit of the hill with panoramic views down to the coast. Several building enclosures and remains of building are still discernible. Some of these however have almost certainly been reused as sheep enclosures in the three thousand years since it was a defensive structure. This makes it difficult to tell what is original and what is more recent repurposing.
The entire of this area is covered in iron age history. Hut circles can be found all over the moor along with burnt mounds, cairns and stone circles. Further along from here are the Caves of Kilhern, an impressive chambered cairn.