According to legend, stolen loot worth billions of dollars was buried in South East Asia during World War II. In the present day, a team of experts embarks on a quest to find the fabled treasure.

Herman Mudgett, whose alias was H.H. Holmes, is believed to have been the first serial killer in America, potentially responsible for as many as 200 murders in the late 19th century. Around the same time, Jack the Ripper famously killed at least five people on the streets of London. In this series, Jeff Mudgett -- Holmes' great-great-grandson -- tries to prove a controversial theory that Holmes and Jack the Ripper were the same person.

Although it's not as famous as the Bermuda Triangle, the Alaska Triangle has more unsolved missing-person cases than any other location on Earth -- more than 20,000 people have vanished in the area in the last 50 years.

Brothers Rick and Marty Lagina search for hidden treasure on an island off Nova Scotia. The rewards could be incredible... but legend says the loot is guarded by a violent hex.

Are details of the Roswell incident, a potential 9/11 conspiracy, or the Kennedy assassin handed down from President to President? Experts investigate some of the USA's biggest secret

Investigation into high-profile air disasters, re-creating events on disaster-hit flights, to uncover the causes of the crashes.