The tumulus | ©Aeleftherios / CC-BY-SAThe tumulus was called
bosse de la Prière("Prayer's bump") in Saint-Nazaire area! It was discovered in 1873. This huge, so huge megalithic building has 2 funeral rooms (one of them used to be a tomb, in Gallo-Roman era). The tumulus is 120 metres circumference, 30 metres in diameter and 3 metres high, raised between 4 000 and 4 500 years BC!