Dowth (Irish: Dubhadh) is the site of Neolithic passage tombs near the River Boyne in County Meath, Ireland.

The Royal Irish Academy carried out a botched excavation in 1847, leaving a large crater in the mound that has never been repaired.

Quartz was found fallen outside the kerbing, suggesting that the entrance to this tomb was surrounded by glittering white stone, as at Newgrange.

The longest of the passages (Dowth North) is 18.2 metres in length and is crossed by 3 sill-stones and ends in a cruciform chamber[4] with a lintelled (not corbelled as in Newgrange or Knowth[citation needed]) roof.

[4] In Dowth North, several of the orthostats (upright stones) of the passage and chamber are decorated with spirals, chevrons, lozenges and rayed circles.

The right-hand arm of the cross leads into another long rectangular chamber with an L-shaped extension entered over a low sill, sometimes referred to as 'the annex'.

Until recently the cruciform tomb was reached by climbing down a ladder in an iron cage, and crawling about over loose stones.

Kerbstone 51, sometimes called the Stone of the Seven Suns, features a number of radial circular carvings,[5] similar to those at Loughcrew.

Martin Brennan, author of The Stars and the Stones: Ancient Art and Astronomy in Ireland – Thames and Hudson 1983,[11] discovered the remarkable alignment during the course of his ten-year study in the Boyne Valley.