In ancient times, Pompeii was one of the largest cities in the Roman Empire. Its 20,000 inhabitants lived in the shadow of Vesuvius, which they believed was nothing more than a mountain. But Vesuvius was a volcano. And on the morning of August 24, A.D. 79, Vesuvius began to erupt. Within twenty-four hours, the entire city of Pompeii--and many of its citizens--had been utterly annihilated. It was not until hundreds of years later that Pompeii...