The neolithic tomb of Knowth (c. 3200BC) contains the largest assemblage of megalithic art in Europe. Most of the art, such as this example, features circles, spirals, or lozenge patterns. County Meath, Ireland. [OC] [4032×3024]

Knowth is part of the Brú na Bóinne complex, a collection of neolithic tombs including the more famous Newgrange, which is estimated to date from around a century after Knowth. Despite Newgrange being more famous, Knowth features a larger collection of megalithic art, much of which (including this stone) is arranged around the base of the tumulus. Knowth’s various carved stones account for more than 1/3 of all the megalithic art in Western Europe. The site continued to be used in different ways through the centuries, including being used by the Normans, who built a small fort atop the mound, over 3 millennia after its original construction. Archaeological excavations began in 1941, and today the site open to the public through guided tours.