Milan-Riomaggiore-Naples-Matera-Alberobello-Otranto-Lecce-Rome (be sure to click through to the videos at the end)
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Riomaggiore: train station. There's a tunnel to the left as well and when the train arrives the front and back parts are in a tunnel, the middle looks out over the sea. We had a picnic lunch in the plaza overlooking this inlet, then boarded the train for Naples.