Beat a path through deepest Kazimierz to reach this rare interactive museum, spread out around an old tram depot--your efforts will be rewarded, especially if you're traveling with children. First make head to the "Fun and Science" section, where feats of engineering are explained by letting kids build their own bridges, pull levers, and generally make things sparkle, crackle, and bubble. The transportation section concentrates on Polish cars, such as a Polski Fiat car from 1936, weird post-war prototypes (look out for the back-to-front one from 1957), and classic local makes from the 1960s.