Penrhosfeilw Standing Stones
Penrhosfeilw Standing Stones, also known as the Holyhead Mountain Standing Stones or Cytiau'r Gwyddelod in the broader local context, are a pair of ancient megalithic standing stones located on the western tip of Holy Island (Ynys Gybi) in Anglesey, northwest Wales. Positioned near the small hamlet of Penrhosfeilw and not far from South Stack lighthouse, these stones represent one of the more evocative and atmospheric prehistoric monuments on an island already rich with ancient sites. The pair of upright stones, dating broadly to the Neolithic or early Bronze Age period — likely somewhere between 3000 and 1500 BCE — stand as enduring sentinels in one of the wildest and most exposed corners of Wales. They are listed as a Scheduled Ancient Monument, reflecting their recognised importance as part of Britain's prehistoric heritage.
The two stones stand in a roughly north-south alignment, both reaching a height of approximately 1.8 to 2 metres, making them substantial and visually commanding despite their relative simplicity. Their exact original purpose remains unknown, as is true of most standing stones in Britain and Ireland, but theories range from ceremonial and ritual functions to territorial markers, astronomical alignment points, or focal elements within a broader ritual landscape. The area around Holy Island is dense with prehistoric activity — burial chambers, hut circles, and other earthworks dot the landscape — suggesting this was a region of considerable significance to communities living here thousands of years ago. Whether the stones were erected as part of a larger monument complex or stood independently is not definitively established, but their placement in such a dramatically exposed location suggests intentionality and meaning that went beyond the merely practical.
In terms of physical character, the stones are composed of the ancient Pre-Cambrian rock that makes up much of Holy Island's bedrock — a dark, gritty, rough-textured stone that feels deeply embedded in geological deep time. Standing beside them in person, particularly on a blustery Atlantic day, there is a palpable sense of weight and age. The wind off the Irish Sea is almost constant here, and the grasses and heathland around the stones flex and shiver with it. Seabirds — choughs, ravens, and gulls — are frequently visible overhead or perched on the rocks nearby, and the distant boom of surf on the coastal cliffs adds an aural backdrop that makes the silence between gusts feel all the more profound. The stones themselves show the mottled colouring of lichen — grey-greens, pale yellows, and rust orange — which softens their surfaces and speaks to centuries of exposure to Atlantic weather.
The landscape surrounding the Penrhosfeilw Standing Stones is genuinely spectacular. The site sits on the rough heathland and low-lying moorland of Holy Island's far western tip, with Holyhead Mountain (Mynydd Twr) rising to the northeast — the highest point on Anglesey at 220 metres. The coast path nearby provides access to dramatic cliffs and the iconic South Stack lighthouse, which perches on a small island connected by a suspension bridge and is famous for its seabird colonies, particularly razorbills and puffins during the breeding season. The RSPB South Stack Cliffs reserve is virtually on the doorstep, making the wider area an exceptional destination for wildlife enthusiasts. To the north and west, the land falls away toward open sea, with clear days offering views toward the Wicklow Mountains of Ireland. The isolation and raw beauty of this corner of Anglesey make a visit to the standing stones part of a much richer immersive experience.
For visitors, the stones are freely accessible and there is no charge to visit. They sit close to a minor road near Penrhosfeilw farm, and there is limited roadside parking in the vicinity. From the road it is a short walk across open ground to reach the stones, and the terrain is generally manageable, though it can be boggy after rain. The nearest substantial town is Holyhead, roughly three to four kilometres to the northeast, which has shops, cafés, and transport links including the ferry terminal to Dublin and a mainline railway station. The B4545 road connects the area to Holyhead. The best times to visit are late spring and summer, when the heathland is in flower with gorse and heather, the seabirds are active at South Stack, and the days are long enough to explore the wider coastal landscape at leisure. Winter visits are entirely possible and carry their own atmospheric reward, but the weather can be severe and the paths muddy.
One of the more intriguing aspects of the Penrhosfeilw stones is their position within a landscape that continued to be settled and used intensively into the Iron Age and beyond. The name "Cytiau'r Gwyddelod" — meaning roughly "the Irishmen's huts" — applied more broadly to hut circle settlements in this area reflects a folk memory of cultural connection across the Irish Sea, though modern archaeology understands these structures as the remains of native late prehistoric and Romano-British settlements rather than Irish incursions. Holy Island's long human story, from Neolithic tomb builders through Bronze Age pastoralists to the later Christian heritage centred on the church of St Cybi in Holyhead, layers meaning upon meaning into the landscape. The standing stones sit at the very beginning of that sequence — the oldest human marks on a land that people have called home, in one form or another, for five thousand years or more.