Positano is one of the most beautiful places in the world. It would have been astonishing if wealthy Romans had not already discovered the place. That there were ruins on this site is almost a d’oh, not to take anything from the professionals who have worked so hard to uncover it.
The Romans of the time would assume that everything had been destroyed by the volcano. Then of course who would want to live and build there after a volcano had killed the previous occupants?
I have to wonder how many generations passed before people started building there again?