The subte (subway) is one of the quickest ways to get around. Packed trains mean it's not always the most comfortable, though it's generally fairly safe. The stations are reasonably well patrolled by police and many are decorated with artworks. You'll likely hear musicians and see actors performing on trains and in the stations.
Single-ride tickets to anywhere in the city cost 1.20 pesos; you can buy passes in stations for 1, 2, 5, or 10 trips or a rechargeable contact-free card called Monedero. The subte shuts down around 11 pm and reopens at 5 am.
Línea A travels beneath Avenida Rivadavía from Plaza de Mayo to Carabobo in Flores and is serviced by handsome but rattling antique wooden cars. At this writing two new stations were under construction in Flores.
Línea B begins at Leandro Alem Station, in the financial district, and runs under Avenida Corrientes to Los Incas Station in Parque Chas, and will eventually continue on to Villa Urquiza.
Línea C, under Avenida 9 de Julio, connects the two major train stations, Retiro and Constitución, making stops along the way in Centro and San Telmo.
Línea D runs from Catedral Station on Plaza de Mayo to Congreso de Tucumán in Belgrano.
Línea E takes you from Bolívar Station, at Plaza de Mayo, to Plaza de los Virreyes, in the neighborhood of Flores.
Linéa H, the subte's newest line, is only partially open, and runs from Plaza Miserere in Once to Caseros, crossing lines A and E. It will eventually be extended north to Retiro, crossing lines B and D, and south to Pompeya.
Metrovías (800/555–1616. www.metrovias.com.ar.)
Monedero Card (800/362–6663. www.monedero.com.ar.)