Its dungeons have housed many unfortunate prisoners, many dangerous secrets. So secure was this stronghold, that it was able to bend the will of perhaps the greatest villain in history; Vlad Dracula himself. Parcasters - Who was the Man in the Iron Mask? The king’s brother? The queen’s lovechild? A poor unlucky valet? This week we do our best to find out on Unexplained Mysteries! Available now on parcast.com/unexplained