Following our morning in the Underground Salt Cathedral of Wieliczka , we decided to go the other direction in the afternoon by going uphill to learn more about the Kings and Queens of the Polish people. Wawel Hill , situated on the banks of the fabled Vistula River , is a castle complex built in the 8th Century serving as the political center of the Polish people for over a millennium. The complex includes the Royal Castle and Wawel Cathedral , which contains the mausoleum of the Polish Monarchs. * The astounding view of the Wawel Cathedral grounds! The castle complex has often been described by observers as one of the most fascinating of all European castles .