10. Naples: A Volcano Can Hide Another

Each of its tremors is constantly monitored : the Vesuvius is one of the world’s most famous and dangerous volcanoes. At its feet lies the city of Naples, the third largest city in Italy, and its 970,000 inhabitants. Its eruption, in 79 AD made history and it literally destroyed the cities of Pompeii and Herculaneum. But for centuries, Neapolitans have accepted this risk and benefited from the volcano's resources. However, in the shadow of the Vesuvius, lies another volcano which sleeps in silence : the Phlegrean Fields...