🇮🇪 Ireland · Megalith
Fourknocks Passage Tomb
Neolithic (c.3200–2800 BCE) · Boyne Valley Passage Tomb tradition
Meath passage tomb with wide cruciform chamber, timber-roofed instead of cairn, and profuse engraved art including anthropomorphs.
🇮🇪 Ireland · Megalith
Carrowkeel Passage Tomb Complex
Late Neolithic · Loughcrew-Carrowkeel passage tradition (Boyne variant)
14 hilltop passage cairns (10–21 m) on Bricklieve ridges above Lough Arrow, with cruciform chambers and light boxes.
🇬🇧 United Kingdom · Megalith
Barclodiad y Gawres
Late Neolithic · Irish Sea passage grave tradition
Anglesey cruciform passage grave with spiral-decorated stones and 27 m cairn on coastal headland.
🇬🇧 United Kingdom · Megalith
Calanais Standing Stones
Late Neolithic – Early Bronze Age · Hebridean Late Neolithic
Cruciform setting: central circle 13 m diameter with 4.8 m monolith and avenues N,S,E,W. Most prominent of 19 Callanish sites on ridge above Loch Roag. Potential lunar standstill alignment.