Ever-so-slightly OT, but if you're contemplating a OneWorld RTW, Poland is one of the cheaper (and most convenient) places in the world to buy your xOWEx ticket. Here is the relevant topic.

Haven't been to Warsaw or Krakow since the 70s, but back then the saying in Warsaw was that the best place to see the city was from the top of the Palace of Culture, because it was the only place in the city where you didn't have to see the Palace of Culture.