Jajce
If you are looking for some quiet time away from all the tourists that Jajce is a place for you. Small town of Jajce was the capital of the Kingdom of Bosnia during the Middle Ages and you will definitely feel those ancient vibes while visiting thanks to the hilltop fortress and stone walls that surround it.
A short walk from the city gate will lead you to nearly untouched wilderness and gorgeous nature including Pliva waterfall and Pliva lakes.