Since time immemorial, the mysterious alleys of the menhirs of Karnak have fired people's imaginations. Such a cluster of stone blocks, erected in the same place using completely mysterious technical techniques, can really surprise and puzzle. And numerous legends about them answered various questions: what are dolmens, menhirs, cromlechs, covered alleys - the creation of the gods, a tangible expression of the power of miracles, omnipotent magic, forgotten meanings? Who erected them - invisible forces, giants, gnomes endowed with unknown abilities? This book sums up all the beliefs, all the assumptions about Karnak and the surrounding lands, the richest in megalithic monuments of various kinds in all of France. But the author goes further. He proposes a new hypothesis, bold, but based on texts and careful research: maybe the monuments of Karnak are the last traces of the civilization of Atlantis, which sank at the dawn of History under inexplicable circumstances, a civilization whose existence and disappearance is mentioned only by Plato, trusting Egyptian documents? This Jean Marcal's new hypothesis is based on the most scientific foundations of modern archeology and on the comparative and systematic study of data from history, anthropology, myths and legends. Perhaps the riddle of Atlantis found its roots and its solution in Karna's huge megalithic sanctuaries along the ocean shores? Thus, a perspective presented temperamentally and passionately will undoubtedly touch many, and at least shake some beliefs that have been rooted in people’s minds for centuries.