Pompeii is a vast archaeological site in southern Italy’s Campania region, near the coast of the Bay of Naples. Once a thriving and sophisticated Roman city, Pompeii was buried under meters of ash and pumice after the catastrophic eruption of Mount Vesuvius in 79 A.D. The preserved site features excavated ruins of streets and houses that visitors can freely explore. Herculaneum was an ancient town, located in the modern-day comune of Ercolano, Campania, Italy. Herculaneum was buried under volcanic ash and pumice in the eruption of Mount Vesuvius in AD 79.