White Hill Castle on the Isle of Anglesey

The White Hill Castle, officially spelled Castell Bryngwyn, resides on the Isle of Anglesey. Its beginnings are uncertain although it may have been a religious sanctuary. Pottery from the Neolithic period indicates use during this time, and it may have been a henge monument.

The site is a circular clay and gravel bank covered with grass, standing some 1.5 metres (4.9 ft) high and revetted externally by stone walls. These walls surround a level area some 54 metres (177 ft) in diameter. During the Iron Age, the present wall was built, and it was rebuilt in Roman times and later.

The site is accessible from the A4080 by a footpath. Another path follows the low ridge, southwest over stiles to the Bryn Gwyn stones, or northeast, past the site of the former stone circle of Tre'r Dryw Bach, some 1⁄2 mile (800 metres) to Caer Lêb where it meets a minor road with limited car parking space.

Sources: Wikipedia, OpenStreetMap, Wikidata, Wikimedia Commons