🇮🇪 Ireland · Megalith
Loughcrew — Cairn L Passage Tomb Slieve na Calliagh
Neolithic (3300 BCE) · Loughcrew Neolithic
Slieve na Calliagh Cairn L excavated by Conwell 1860s, sun beam at equinox lights chamber art, Hag's Chair kerbstone.
🇮🇪 Ireland · Megalith
Knowth Passage Tombs — Eastern Necropolis Extension
Neolithic (3350–2800 BCE) with Bronze Age additions · Boyne Neolithic
Brú na Bóinne World Heritage excavated by Eogan 1962–2000, with 300 decorated stones, sundial-like kerbstone K52.
🇫🇷 France · Megalith
Barnenez Passage Mound Finistère — Timestep Variant
Early Neolithic (4800–4300 BCE) · Barnenez (Cerny / VSG)
Brittany's great passage-mound on Kernéléhen peninsula, 11 dolmens in two phases, oldest chamber C1 4850 BCE, with Neolithic engravings and quartz façade.
🇮🇪 Ireland · Megalith
Carrowkeel — Cairn K Passage Tomb
Neolithic (3300–3000 BCE) · Carrowkeel-Keshcorran group
Bricklieve Cairn K excavated by Macalister 1911, with cremations, bone pins and Carrowkeel Ware, views to Kesh above.