ostrovica castle in kulen vakuf, bosnia

kulen vakuf bosnia ostrovica castle fort fortress hill walls ruin ruins federation herzegovina bosanska krajina canton una sana september summer europe balkans architecture building old historic travel tourism bosnian european east south eastern southern picturesque outside outdoors exterior landmark historical medieval stone sunny sunshine roof tiles tiled wood wooden rural blue sky heritage monument turret tower fortified fortification defensive strength stronghold landscape country countryside green hilltop trees woods woodland forest 15th century fifteenth town bench fence grass