Generations later, the truth of serial killer H.H. Holmes's death may be exposed by one of his descendants. Did the government conspire with the mafia about a mysterious helicopter crash? How might the youngest Romanov daughter have escaped slaughter?

Josh Gates looks at some of history's most intriguing hoaxes and unexplained events, including the Amityville Horror, the strange fate of a military submarine crew, and a phenomenon in which people's body fat causes them to burn alive.