Herculaneum was a seaside town, until Vesuvius happened. ;-)
Yeah, it was pretty crazy looking down into the pit that was Herculaneum, to see “where the beach used to be”, and turning around to look for the sea, and realizing it was pretty far away. I pity the Italians if Vesuvius ever decides to really blow its top again. From the summit, Naples looks like a tasty morsel.