The Pazin Castle is a medieval fortification built on a solid rock situated in the middle of the town of Pazin, the administrative seat of Istria County, Croatia. It is the largest and best-preserved castle in that westernmost Croatian county.
It overlooks the deep gorge of the Pazinčica Foiba river, a small karst subterranean river that disappears there through sinkhole and continues underground.
The fortified structure was constructed of hewn stone, and, during its 11-century-long history, subjected to several major reconstructions and renovations. There are two museums to be visited in Pazin's castle, the Ethnographic Museum of Istria and the Pazin Town Museum.
Wikipedia https://en.wikipedia.org/wiki/Pazin_Castle
Coordinates 45°14'24.924" N 13°55'50.367" E