Hi! I want to recommend you visit in Krakow- the most popular city in Poland. There are a lot of interesting place like the Kazimierz district (with the oldest synagouge), Wawel Castle nad Mariacki Church! There are also interesting concerts: Chopin concert, Klezmer music or Polish Folk (organized by Pro Arts Artisic Agency), which take place in the beautiful places in the Old Town. I have spend in this city one week ? It was a great holiday!