I don't know about scariest place but there is a valley known as Ghost Valley (Waadi e jin) in Saudia Arabia and there lives loads of ghosts that don't hurt people and even they offer prayers and people go and visit that place and my aunt and uncle went there and they told me that they can feel them sometimes see them too but they don't get scared of them .. You can see one of them reciting Holy book here: http://www.youtube.com/watch?v=rCSSQhvDUHU