The Cuauhtémoc brewery, the oldest brewery in Mexico (established in 1890), fills six million bottles of Bohemia, Dos Equis and Tecate and other beers every day. Free brewery tours are given more or less hourly. Reservations are recommended (especially if you’d like a tour in English), but you can just show up and see if there’s space. Tours start in front of the pleasant outdoor beer garden where you might get a free mug of Carta Blanca.