More than 48 standing stones, classified historic monuments, stand proudly in meadows to the north of Médréac (4km from the village centre). This megalithic group, which comprises only menhirs, is of major importance. The quartz stones were erected by the first Neolithic farmers (5000BC - 2000 BC) in five rows running north-north-west to south-south-east. They vary in length from 1.80m to 5.40m. Their layout is unique in Brittany and remains a mystery to experts. Archaeological excavations revealed polished axe heads and Neolithic adzes.