Bedd Arthur
Pembrokeshire, United Kingdom
Bedd Arthur ("Arthur's Grave") is a possibly Neolithic hengiform monument megalithic site in the Preseli Hills in the Welsh county of Pembrokeshire. Thirteen upright stones and at least 2 fallen ones, each around 0.6 metres (2.0 ft) high form an oval horseshoe with similarities to the earliest form of Stonehenge.
Monument data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).