The Wawel Royal Castle (Polish pronunciation: [ˈvavɛl] ; Zamek Królewski na Wawelu) and the Wawel Hill on which it sits constitute the most historically and culturally significant site in Poland. A fortified residency on the Vistula River in Kraków, it was established on the orders of King Casimir III the Great and enlarged over the centuries into a number of structures around a Polish Renaissance courtyard. It represents nearly all European architectural styles of the Medieval, Renaissance and