A Tourist in Rome - Bus 40 and 64
Bus 40 and Bus 64 both cut across Campus Martius, which is not served by the metro, providing inexpensive public transportation access to many popular tourist sites. Bus 64 is stops everywhere, and bus 40 is an express bus, taking essentially the same route, only stopping at fewer stops, therefore going faster and being less crowded. Be very careful on these two buses for pickpockets. They are popular with pickpockets because tourists use them often, and tourists carry money and expensive cameras, and don't know their way around very well.
The bus route begins at Termini, in the bus station in front of and to the right of the train station (look for the bus number on the signs along each aisleway that the buses pickup their passengers at). From there they go to (or can be picked-up from):