Major post offices will change cash or American Express travellers' cheques:

Centro Storico : Piazza S.Silvestro, Mon - Fri 8.30am - 6pm, Sat 8.30am - 12.50pm. Metro A : Spagna

Termini : Via Terme Diocleziane 30, close to the Mc Donald's on Piazza della Repubblica Mon - Fri 8.30am - 6pm, Sat 8.30am - 2pm. Metro A : Termini

Vatican : Via di Porta Angelica 23, close to Piazza Risorgimento, Mon - Fri 8.30 - 6pm, Sat 8.30am - 11.50am. Metro A : Ottaviano.