Krakow is definitely somewhere worth visiting...i don't think it is pretty as some places although the old town is quite nice but i thought the rest of it looked a bit run down...although i had to remember what Poland had been through! How the war affected it and then the years of Communism. When you take that into consideration it isn't doing to badly...and if you are interested in history then this is an amazing place to visit, especially if you are interested in WWII!