🇮🇪 Ireland · Megalith
Knockroe Passage Tomb
Neolithic (c.3200–2800 BCE) · Boyne Valley Passage Tomb tradition
Kilkenny dual-passage tomb with lavish megalithic art, aligned to both midwinter sunrise and sunset.
🇮🇪 Ireland · Megalith
Newgrange
Neolithic · Irish Middle Neolithic (Boyne Valley)
Grand passage tomb in the Bend of the Boyne with 85 m diameter cairn, decorated kerbstones and cruciform chamber. Famous for winter solstice sunrise illuminating chamber through roof-box.
🇬🇧 United Kingdom · Megalith
Maeshowe Chambered Cairn
Late Neolithic · Grooved Ware Orcadian
Finest Orkney chambered cairn: 36 m mound, long passage, corbelled chamber. Midwinter sunset illuminates chamber. Bears 12th-century Viking runic inscriptions (>30).