Rome’s ATAC bus network has central hubs at Termini, Piazza Venezia, Largo Argentina and Piazza San Silvestro. Newsagents sell maps; fermata (bus stop) signs list the routes of the lines which stop there. Buy tickets at newsstands, tobacconists or machines at major stops. Stamp the ticket in the machine on the bus; they are valid for 75 minutes with unlimited transfers.
Two lines intersect at Termini, mainly serving the suburbs. Good tourist stops include Spagna (Spanish Steps), Colosseo, San Paolo (basilica), Ottaviano (six blocks from St Peter’s), and Cipro (six blocks from Vatican Museums). Tickets for bus and metro are the same. The metro is currently receiving an upgrade and delays are possible.