On the border between the Alta and Media Valtellina, upstream between the municipalities of Grosio and Grosotto, the prehistoric population of the Reti has left a mark of its presence by carving on the rocks suggestive representations of everyday life. Graffiti which cover a lapse of time which dates from the late Neolithic to the iron age: warriors, animals, anthropomorphic figures distributed on the surface of the spectacular “Rupe Magna”, the largest carved rock of all the Alpine expanse with more than 5000 figures. The incisions are disseminated in the Park which is dominated by the size of the ruins of the two Venosta castles (XI and XIV century), erected at the point of major dominance on the rest of the valley. Today, this complex constitutes the Park of the Rupestrian Incisions. The easy naturalistic journey to get to it enables those keen on history, excursionists and plain curious persons to view closely the evidence of an ancient past, which has seen the Media Valtellina populating itself as from very ancient times. Its surface has been modelled by the erosive action of the atmospheric agents, particularly by the melting of the glaciers, which have also impressed on it a series of gutters. The oldest figures, spirals and U shaped figures turned upside down; date back to the IV millennium B.C. (between the end of the Neolithic period and the beginning of the Copper age). A group of figures represent men in schematic attitudes (the technical term is “oranti”), and armed with a round shield and a sword or a club. But the largest group of figures represented by armed men, goats and deer, of signs of symbolic serpents, of figures of drift rabbits, of signs in the form of a labyrinth, date back to the Bronze age. The journey along the archaeological track is accompanied with explanatory panels, but one can also avail oneself of a guide. For information one can refer to the Park’s offices, situated in Villa Visconti Venosta of Grosio, where one also finds a documentation centre and a specialised library. To fully enjoy the spectacle it is advisable to arrive at the Park late in the afternoon, when the side light of the sun allows the carved signs re-emerge from the rock.