🇮🇪 Ireland · Megalith
Loughcrew Cairn T (Hag's Cairn)
Late Neolithic · Boyne / Loughcrew passage tradition
35 m Loughcrew chief tomb with cruciform chamber whose art is illuminated by equinox sunrise.
🇬🇧 United Kingdom · Megalith
La Hougue Bie
Middle Neolithic (~4000–3500 BCE; medieval chapel atop) · Armorican / Channel Neolithic (Norman Neolithic)
Jersey's paramount Neolithic monument crowns a 12-m artificial mound containing a cruciform passage grave with a 12-m roofed chamber aligned so equinox sunrise illuminates the rear cell.
🇮🇪 Ireland · Megalith
Knowth
Neolithic · Boyne Valley Neolithic
Largest passage tomb complex in Brú na Bóinne: Great Mound with two passages (east-west) and 18 satellite tombs.