The Wawel Royal Castle in Kraków, Poland

The Wawel Royal Castle (Polish pronunciation:; 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 several structures around an Italian-styled courtyard. It represents nearly all European architectural styles of the Medieval, Renaissance, and Baroque periods.

The castle is part of a fortified architectural complex erected atop a limestone outcrop on the left bank of the Vistula River, at an altitude of 228 meters above sea level. The complex consists of numerous buildings of great historical and national importance, including the Wawel Cathedral where Polish monarchs were crowned and buried. Some of Wawel's oldest stone buildings can be traced back to 970 AD, in addition to the earliest examples of Romanesque and Gothic architecture in Poland.[5][6] The current castle was built in the 14th century and expanded over the next hundreds of years. In 1978 Wawel was declared the first World Heritage Site as part of the Historic Centre of Kraków.

Thanks and credit to Google Earth Studio for this aerial video.