Leuven, Flanders, Belgium
Poznań, Greater Poland Voivodeship, Poland
Grudziadz, Kuyavian-Pomeranian Voivodeship, Poland
Radom, mazowieckie, Poland
Bydgoszcz, Kuyavian-Pomeranian Voivodeship, Poland
Rotterdam, Zuid-Holland, Netherlands
Toruń, kujawsko-pomorskie, Poland
Basel, Switzerland