A walk through the shady forest of Gallipoli Cognato, in the territory of Oliveto Lucano (MT), to discover a Mesolithic site, the fortified Acropolis of an ancient Lucanian city of the 4th century BC. and of the megalith Pietra de la Mole, an ancient stone calendar with a crack in the middle which, at sunset on the winter solstice, lights up with the rays of the sun.