If you want to travel back in time to an era when tango ruled Buenos Aires, few places will do you better. The beautiful main dance hall here is straight from the Belle Epoque; you'll half-expect Carlos Gardel himself to show up behind the mic. Dressed in black, men and women tango while patrons at side tables respectfully study their techniques. Don't look too closely at anyone, however, unless you know what you're doing: The Cabaceo—staring from across a room, presumably to lure a partner onto the dance floor—are taken seriously. Food is served, but don't bother unless you're famished; it's only so-so. If you're looking to find a tango teacher, one will probably find you first at this venue; many instructors come here seeking students for private lessons.