Sokograd

Sokograd, also known as Pliva or Plivski grad, Pliva-Soko, Sokol-grad, Soko-grad, or simply Soko or Sokol, is a medieval fortress with a castle town in the Pliva river valley, between Gerzovo and nearby Šipovo, in Šipovo municipality, Republika Srpska entity of Bosnia and Herzegovina. It was a very important fortress for the medieval Bosnian state, and the center of the župa Pliva. It was built in a canyon on a steep slope high above the river Sokočnica, which flows into Pliva in Šipovo.

Source: Wikipedia