Question: What earliest form of prehistoric monument in Wiltshire, England was Bedd Arthur similar to?

<P0-S0> Bedd Arthur or Arthur's Grave is a possible Neolithic hengiform monument megalithic site in the Preseli Hills in the Welsh county of Pembrokeshire. <P0-S1>  Thirteen upright stones and at least 2 fallen ones, each around 0.6 m high for an oval horseshoe with similarities to the earliest form of Stonehenge. <SEP> <P1-S0> Stonehenge is a prehistoric monument in Wiltshire, England, 2 mi west of Amesbury and 8 mi north of Salisbury. <P1-S1>  It consists of a ring of standing stones, with each standing stone around 13 ft (4.1 metres) high, 6 ft 11 in (2.1 metres) wide and weighing around 25 tons. <P1-S2>  The stones are set within earthworks in the middle of the most dense complex of Neolithic and Bronze Age monuments in England, including several hundred burial mounds. <SEP> <P2-S0> Newgrange (Irish: "Sí an Ḃrú" or "Brú na Bóinne") is a prehistoric monument in County Meath, Ireland, located 8 km west of Drogheda on the north side of the River Boyne. <P2-S1>  It was built during the Neolithic period, around 3200 BC, making it older than Stonehenge and the Egyptian pyramids. <P2-S2>  The site consists of a large circular mound with an inner stone passageway and chambers. <P2-S3>  Human bones and possible grave goods or votive offerings were found in these chambers. <P2-S4>  The mound has a retaining wall at the front, made mostly of white quartz cobblestones, and is ringed by engraved kerbstones. <P2-S5>  Many of the larger stones of Newgrange are covered in megalithic art. <P2-S6>  The mound is also ringed by a stone circle. <P2-S7>  Some of the material that makes up the monument came from as far away as the Mournes and Wicklow Mountains. <P2-S8>  There is no agreement about what the site was used for, but it is believed that it had religious significance. <P2-S9>  Its entrance is aligned with the rising sun on the winter solstice, when sunlight shines through a 'roofbox' and floods the inner chamber. <P2-S10>  Several other passage tombs in Ireland are aligned with solstices and equinoxes, and Cairn G at Carrowkeel has a similar 'roofbox'. <P2-S11>  Newgrange also shares many similarities with other Neolithic constructions in Western Europe, such as Maeshowe in Orkney, Scotland and Bryn Celli Ddu in Wales. <P2-S12>  It is the most famous monument within the Neolithic Brú na Bóinne complex, alongside the similar passage tomb mounds of Knowth and Dowth, and as such is a part of the Brú na Bóinne UNESCO World Heritage Site. <SEP> <P3-S0> The Vinča culture, also known as Turdaș culture or Turdaș-Vinča culture, is a Neolithic archaeological culture in Central Europe and Southeastern Europe, dated to the period 5700–4500 BC. <P3-S1>  Named for its type site, Vinča-Belo Brdo, a large tell settlement discovered by Serbian archaeologist Miloje Vasić in 1908, it represents the material remains of a prehistoric society mainly distinguished by its settlement pattern and ritual behaviour. <P3-S2>  Farming technology first introduced to the region during the First Temperate Neolithic was developed further by the Vinča culture, fuelling a population boom and producing some of the largest settlements in prehistoric Europe. <P3-S3>  These settlements maintained a high degree of cultural uniformity through the long-distance exchange of ritual items, but were probably not politically unified. <P3-S4>  Various styles of zoomorphic and anthropomorphic figurines are hallmarks of the culture, as are the Vinča symbols, which some conjecture to be the earliest form of proto-writing. <P3-S5>  Though not conventionally considered part of the Chalcolithic or "Copper Age", the Vinča culture provides the earliest known example of copper metallurgy.