Knowth
Donore, County Meath, Ireland
The largest passage tomb of the Boyne valley complex, a 12-metre mound with two passages, 127 kerbstones, and the heaviest concentration of megalithic art in Western Europe, visited on guided tours from the Brú na Bóinne centre.
Knowth (Irish Cnóbha) was built around 3200 BC as a great mound roughly 12 metres high and 67 metres across, ringed by 127 kerbstones of which three are now missing, and pierced by two independent passages running east-west into separate chambers. The eastern passage ends in a cruciform chamber with three recesses and basin stones for cremated remains; the western ends in a simpler undifferentiated chamber. George Eogan led the site's excavation from the 1960s through the 1980s, and parts of the monument were reconstructed. Archaeoastronomers, including Frank Prendergast in published work on the tomb's geometry, have studied the passages' alignment behavior near the equinoxes, though no Knowth light phenomenon is staged the way Newgrange's solstice lottery is. In the early medieval period the mound became a royal seat, the residence of the Kings of Northern Brega.
Knowth holds more than 200 decorated stones, which standard summaries put at more than a third of all megalithic art in Western Europe; motifs include spirals, lozenges, serpentiforms, and what has been argued to be the oldest known illustration of the moon. Access differs from Newgrange: tours reach the mound's exterior, and the OPW states plainly that there is no access to the chambers. Its companion Dowth remained in private hands until 2023, when the Irish state bought the 552-acre Dowth Hall demesne to create the Boyne Valley (Brú na Bóinne) National Park; the Dowth tomb itself is not part of the standard visitor-centre tours.
Visiting
Brú na Bóinne Visitor Centre (OPW). All access runs through the visitor centre by shuttle bus, guided tour only. The Knowth Tour + Exhibition runs once daily between March 1 and November 1; from November 2 to the end of February only Newgrange tours run. Pre-booking is essential; no third-party sellers are authorized and resale tickets will be refused. Check the OPW page for exact Knowth ticket pricing. There is no chamber access at any time.
Photo: AndieW, CC BY-SA 4.0, via Wikimedia Commons ([source](https://commons.wikimedia.org/wiki/File:Knowth_passage_tomb_1.jpg))
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