Agostino Petroni/Undark

More from Agostino Petroni/Undark

Tourists visit the Solfatara crater, part of the Campi Flegrei Volcano, the biggest caldera of Italy.

Up the coast from Pompeii, another city grows on top of an underground volcano Up the coast from Pompeii, another city grows on top of an underground volcano

By Agostino Petroni/Undark