Wawel Royal Castle - Credit: Wikimedia Commons
The Wawel Royal Castle (; 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 an Italian-styled courtyard. It represents nearly all European architectural styles of the Medieval, Renaissance and Baroque periods. Read more on Wikipedia
Source: en.wikipedia.org