Hi, all. Recently I recall that there's a TV show (from discovery channel) about investigating a haunted castle (not 100% sure, maybe a big old house) . It's a very old show. (before at least 2012. even possible in 2006 or before) The most impressive thing is in the end of the show, the host tried to talk with ghosts, then he asked if you (ghosts) are here, please let us know, and then there is clear knocking walls (from distant place in this castle?) sound soon. And then the show says something i can't remember exactly. It's something like "believe it or not, it may be just coincidence or it may be a real evidence". I have looked for many shows from youtube. A show series calls "paranormal" from discovery channel (in 2006?) seems gone in this world. Only few articles say paranormal is a series that contains some shows. Because I haven't watched it, I don't know what it is. Sorry for so few clues, anyone helps me? Thank you.