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However, although Newgrange is the most famous site within the Bru na Boinne complex in County Meath, the mound at the Knowth megalithic tomb (Newgrange's sister site) has a huge number of rock engravings around its circumference.

Indeed, Knowth is reputedly home to about one third of all megalithic art in Western Europe.

Dating this ancient art can be a very difficult process, often involving radiometric and thermoluminescence methods.

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Rock art is a rather vague term which denotes prehistoric man-made markings on natural stone.Petroglyphs have been discovered all over the populated world, notably in parts of Africa, Scandinavia, Siberia, southwestern North America, Northern and Western Australia, and the Iberian Peninsula.Some of these images have a special cultural and/or religious significance for the societies that created them.Cupules have also been referred to as "pits", "hollows", "cups", "cup marks" - even "pot-holes".The most important sites of engraved cave art include: Chauvet Cave (30,000 BCE), Le Placard Cave (17,500 BCE), Roc-de-Sers Cave (17,200 BCE), Rouffignac Cave (14,000 BCE) and Les Combarelles Cave (12,000 BCE).