A few hours south of Rome by car and in the neighbourhood of Naples is the active volcano Mt Vesuvius. Everyone knows Pompeii was buried in 79AD by an eruption which left an interesting snapshot in time for us present day tourists to climb over. Less well know is that the town of Herculaneum was also buried by the same eruption.
Pompeii is easy to find, straight from the Autostrada and you’re there. Herculaneum on the other hand is in the town centre but has an underground carpark which is reasonably priced. The ruins are smaller than those of Pompeii but some suggest better preserved and less tourists.
Ideal place for a day trip from the Amalfi Coast or Rome.