The term "hidden jewel" is used far too often and too loosely to have any meaning. All these terms, "pearl of...", "jewel of...," are thrown about without much forethought, or simply as marketing ploys to fleece tourists. Yes my hometown Dublin is marvellous, but €2 for a small cup of coffee in a non-central cafe? But many of these places described as hidden are not. But this town, Knin, is truly deserving of the word. It is hidden from view, from consciousness, from Croatians, and therefore, the world.
It still bares the legacy and scars of the vicious Homeland War that so ravaged this particular area of southern Europe. There is a massive displacement of people, existing social and financial problems, and an unwillingness by the international community or national government to rectify the problems they helped create. The area is asleep.
The locals are friendly, warm, and helpful, even if unable to speak English. They will not treat you with disdain as along the coast, but will actually go out of their way to make you feel welcome.
You will come back again and again to Knin after your first visit!