The visitors are usually greeted almost immediately (thanks to editing, no doubt) by an inexplicable sense that they're not alone; as they proceed on their tours, many see strange happenings like inanimate objects moving, glass breaking, and blurry shapes passing by. Some claim to hear voices, and those with recorders capture and replay phrases like "so much pain" and "out, out, out." Others describe physical encounters with spirits, whom they say pull on them, choke them, and pass through their own bodies.
Not surprising, there's plenty of screaming, crying, and obvious emotional distress on the investigators' part -- the frightening content is guaranteed to upset sensitive viewers even at the teen level. Many viewers probably won't be surprised to hear that skeptics question the series' credibility (which may be why it doesn't offer any time to anyone who could offer alternative explanations for the supposed paranormal activity). In the end, viewers must decide for themselves whether they believe the investigators' claims. But regardless of credibility, the show is tense and frightening. This is definitely a know-your-child situation, so be sure to take a close look at disturbing content like descriptions of death and violence and supposed ghostly encounters to assess whether your young viewers are ready for it.