Mount Vesuvius
The historian Diodorus Siculus said that there was a story that Hercules once passed through the country of Cumae when he was going to Sicily. There, he found a place called "the Phlegraean Plain" (phlegraion pedion, "plain of fire"). It said that it was "from a hill which anciently (from a long time ago) vomited out  called Vesuvius." Giant "sons of the Earth" lived inside it. With the help of the gods, he helped the people there and went on. An ode by Martial in AD 88 suggests that Venus and Hercules were worshipped in the place that was destroyed by the eruption in AD 79.