The document summarizes several UNESCO World Heritage sites in Poland, including Cracow's Historic Centre containing the largest market square in Europe and remnants of the 14th century city walls; Malbork Castle, the largest medieval brick castle in Europe; the rebuilt Warsaw Old Town destroyed during World War II; the underground Wieliczka Salt Mine combining centuries of history; and the medieval town of Toruń founded by the Teutonic Order in the 13th century with imposing buildings and a 15-meter high Leaning Tower.