The Loughcrew Cairns, also known as the Loughcrew Passage Tombs, are prehistoric burial and ritual grounds 5,200 years old (4000-2500 BC). These were constructed by the Neolithic or Stone Age people. A cairn is a man-made pile or stack of stones, often serving as a burial monument. This complex comprises 32 recorded cairns scattered over four hills. The cairns were rediscovered in 1863 by Eugene Conwell, who happened upon them during a picnic. Incredible. read more