Castell Henllys

Castell Henllys is an important archaeological site in north Pembrokeshire, Wales, on the A487 road between Newport and Cardigan, in the parish of Nevern.

The Iron Age hillfort has been the subject of an ongoing excavation for more than twenty years, accompanied by an exercise in reconstruction archaeology whereby experiments in prehistoric farming have been practised. Four roundhouses and a granary have been reconstructed on their original Iron Age foundations, some 2,000 years old, the only site in Britain where this has been done.

Historic UK say:To the north of the site, where the entrance was, there are significant earthworks in the shape of several ditches and banks. Inside these fortifications, archaeologists have found evidence for numerous Iron Age roundhouses dating to between 500 and 100BC.

Source: Wikipedia