Les megalithes du departement du Morbihan aims at a better understanding of megalithism, or more precisely megalithisms, and presents a new approach to the relationship between standing stones (menhirs) and tombs (dolmens). The architectural analyses developed raise questions about their complementarity. They are based on a corpus of architectural plans comprising 1413 megalithic monuments from the Department of Morbihan, including 13,200 vertical slabs, the result of thirty years of research and field observations, and including more than 250 unpublished monuments. Two main approaches are...