The Vesuvius is the only active volcano in mainland Europe and one of the most dangerous, because the territory around the volcano presents a high populations density. The Mount Vesuvius (1281 m) sits on the right side of the ancient Mount Somma (1133 m). Both of them are divided by the so named Valley of the Gigants, which is also divided into Atrio del Cavallo (Lobby of the Horse) on the western side and Atrio dell'Inferno (Lobby of the Hell) on the eastern side. At the old times of the antiquity nobody knew that it was a volcano. It was well-known thanks to the excellent wine and through the wonderful green vegetation that has covered the summit. The mountain became famous suddenly with the tremendouns eruption on 79 after Christ, destroying complete cities as Pompeii and Herculaneum. The volcano “sleeps” since its last eruption on 1944.