In fact, scholars say that the mountain is hundreds of thousands of years old and had been erupting for generations. In about 1780 B.C., for example, an unusually violent eruption (known today as the “Avellino eruption”) shot millions of tons of superheated lava, ash and rocks about 22 miles into the sky. That prehistoric catastrophe destroyed almost every village, house and farm within 15 miles of the mountain.