Brú na Bóinne is a UNESCO site in Ireland containing some of the world's most important landscapes from the Neolithic period. The best-known constructions are Newgrange and Knowth, two megalithic passage graves built around 3200 BC, which makes them even older than the pyramids of Egypt.

Surrounded by mystery, a visit to one of the only two heritage sites in Ireland is a must. But, what is the real story behind these impressive constructions?