The easiest way to move within the city by public transportation is to buy the UNICO CAMPANIA TICKET which is valid for underground, buses, cable trains and local trains. It can be valid from 90 minutes up to 3 days. Cost for 90 minutes is 1,20 euros. Daily ticket 3,6 euros.
www.campaniartecard.it
The UNICO CAMPANIA ticket can also be bought, on-line or in Naples, together with the which allows to travel in Naples (€ 16,00) or in and around Naples (€ 27,00) for three days and includes the airport ALIBUS shuttle plus the entrance to n. 3 museums mentioned in the list available on the web-site. The ticket must be validated on your first trip.
Underground Map
To see underground connections to the most interesting tourist destinations within Naples click here: www.unicocampania.it