Fortress of Klis, Croatia

The fortress is located above a town bearing the same name, 11 kilometres (6.8 mi) from the Adriatic Sea, on a pass that separates the mountains Mosor and Kozjak, at the altitude of 360 metres (1,180 ft), northeast of Split in Croatia. Owing to its strategic position, the fortress is regarded as one of the region's most important fortifications.