The most ancient part of the Bay of Naples, The Phlegrean Fields, cover a vast area of volcanic origin on the northern coast. Cuma was the first of the Greek colonies in Italy and is famous for the Acropolis, The Sybil’s Cave, and the beauty of its sea view. Pozzuoli is famous for the Solfatara active volcan and The Flavio Amphitheatre . Recent archeological excavations brought out to light the Roman city , close to the port, called Rione Terra. Baia has imperial thermae.