There’s a little mini-series on S4C Clic at the minute, for Halloween called “Codi Bwganod”. Each episode is just 5 mins long, and tells a Welsh folk/ghost story. They are presented by Jimmy Johnson, who’s a historian and YouTuber who goes by the name of “Welsh Viking”. I know there are some Halloween fans on here, so thought you might be interested! Clic
There’s also a series just started (only one episode up so far), “Cysgu gydag Ysbrydion”, where Iwan Steffan takes his friend Aimee Fox to stay in Wales most haunted houses, to try to persuade her that ghosts exist… Clic (This one has come from the Hansh brand, so has got a language warning on it, in case that affects your decision to watch it.)