"Flegraios" in Greek means blazing, this already points out the main feature of that vaste plain territory which spreds from the river Sebeto, north of Neaples, up to Cuma.
All the territory, in fact, is rich in phenomena of volcanism, finding its most expression in the Solfatara of Pozzuoli, where "moffettes", fumaroles and mud volcanoes, are in constant activity.
Travelling by gradual steps, we encounter the Agnano basin, at a short distance from the Fuorigrotta district housing an important thermal Spa, rich with particular and beneficial radioactive water and mud-baths.
Across tha Domitiana road you arrive to Pozzuoli. In the town you can also admire the Flavio Amphitheatre and, going towards the port, the temple dedicated to the Goddess Serapis, the columns of which emerge from the sea water, its level modified by the bradiyseism; I.E. uplifting and lowering of the crust of the heart.
The ruins of the villas built by the Romans that made famous the town of Baia are still visible, some of these are submerged by the sea. Baia was considered the most luxurious seaside resort of ancient times. In Baia we can admire the castle of the archeological site. Not too far away lies Cuma, one of the first Greek settlements in Italy, world-famous for the "Cave of Sibiyl" in which the oracles were given and for the temple to Jupiter.
In order to reach Campi Flegrei take the train to Naples from Sorrento train station, then, once in Naples, take the metro and stop in "Campi Flegrei"; the other sites are reachable by bus.