Photo: Wikimedia CommonsOpen since 1937, Salon Los Angeles is a gloriously faded ballroom in Guerrero where generations have danced danzon, mambo and cha-cha beneath the famous slogan on the wall. It is the real thing, a working dance hall rather than a tourist show. Go for a themed night, dress up a little, and do not be shy about joining in. Even watching from the edge with a beer is an unforgettable slice of old Mexico City.