15. Plas Teg Mansion, Flintshire
Plas Teg, a Jacobean house near the the village of Pontblyddyn, Flintshire between Wrexham and Mold, is said to be one of Wales' most haunted buildings. One of its late owners was the infamous 'hanging' Judge Jeffries, who is thought to have held court in the home and had people convicted and hanged in the dining room. Reports of paranormal activity include heavy breathing in one bedroom and the spirit of a young girl appearing in the Blue Bedroom.