Poland’s longest river, Vistula, gently meanders through the country from south to north, before emptying into the Baltic Sea near Gdańsk. It flows for 1000 km and all along the river you’ll find sloping grassy banks speckled with shrubs and bushy trees that are studded with colourful flowers. This scene is made even more dramatic by the presence of some of the most stunning castles and palaces. Listed below are the top five spectacular castles and palaces that you shouldn’t miss on your visit to Poland.