Dowth is the third of the great passage tombs of Brú na Bóinne, about 85 metres across and 15 metres high, with two tombs (Dowth North and Dowth South) entered from the west. Unlike its neighbours it was never reconstructed. In 1847 the Royal Irish Academy dug into the middle of the mound, partly with dynamite, and the crater was never filled. One of the kerbstones, the "Stone of the Seven Suns", is carved with rayed circles.
Dowth is not part of the guided tours and the chambers are closed, so all you see is the mound itself, reached directly by road. It is worth a short stop for the quiet: no shuttle buses, no crowds, and a sense of what Newgrange looked like before the restorers arrived. Dowth South catches the low evening sun around the winter solstice.