Laurence Fishburne takes a look at historically important mysteries, well-known myths, and modern legends using new evidence.
Despite centuries of sightings, the most infamous deep-sea monster remains unidentified. Does the Loch Ness Monster exist and, if so, what could it be? (S4, ep 1)
In 1969, an unidentified killer taunted investigators with cryptic ciphers. Explore six theories that could help solve this 50-year-old mystery. (S4, ep 2)
In 1963, President John F Kennedy is assassinated. A suspect is captured but investigators and amateur sleuths still investigate alternative theories. (S4, ep 3)
In 1587, settlers land on Roanoke Island to establish the first English colony in America, but vanish without a trace and leave only cryptic clues. (S4, ep 4)
Delve into the popular theories behind the Phoenix Lights phenomena, a series of widely sighted UFOs observed in Arizona and Nevada back in 1997. (S4, ep 5)
Investigate the theories behind where the Ark of the Covenant - an artefact thought to be the most sacred relic of the Israelites - may be hidden. (S4, ep 6)
The 'Missingest' Man in America: Explore the theories behind the disappearance of former New York Supreme Court judge Joseph Force Crater in 1930, a case which remains unsolved. (S4, ep 7)
The discovery of an ancient device leads historians to theorise about the origins of the Antikythera mechanism. (S4, ep 8)
After centuries of searching, Blackbeard's epic hoard remains missing. As new evidence emerges, the mystery endures - what became of the treasure? (S4, ep 9)
Delve into the theories that could help explain why and how the ancient Egyptians came to build the pyramids. (S4, ep 10)
Explore some of the many theories that could help explain why so many ships, planes and people go missing in the Bermuda Triangle. (S4, ep 11)
Delve into the top theories of where the Nazis hid their wealth, much of which was stolen during World War II. (S4, ep 12)
Explore the most notable theories into the possible whereabouts of Noah's Ark, based on ancient accounts. (S4, ep 13)
Delve into the top theories surrounding the case of Dan Cooper, who hijacked a Northwest Orient Airlines flight, before disappearing without a trace. (S4, ep 14)
There have been thousands of alleged sightings of Bigfoot across the US, but despite growing evidence, the creature has never been officially identified. (S4, ep 16)
The mysterious arrangement of stones found in the English countryside remains a mystery as to how - or why - the landmark was built. (S4, ep 15)
For centuries, explorers put their lives on the line searching for the legendary ancient city of El Dorado, but will anyone ever find it? (S4, ep 17)
Explore the top theories behind what caused the unexplained illnesses in US diplomats in 2017, later known as 'The Havana Syndrome'. (S4, ep 18)
Explore the top theories behind why the ancient Peruvians built the Nazca Lines. (S4, ep 19)
Look into the top theories behind where the tomb of Cleopatra may be located. (S4, ep 20)
In 1996, one of the worst disasters in American history left 230 people dead and questions unanswered in a tragedy that changed the aviation industry forever. (S4, ep 21)
The history books say Adolf Hitler committed suicide in the final days of World War II, but did the Nazi leader die in Berlin or was he able to escape? (S4, ep 22)
Explore the top theories behind what happened to the treasure looted by the Japanese during World War II. (S4, ep 23)
The gruesome murder of a young beauty goes unsolved for decades. There's a long list of suspects, each more mysterious than the last. (S4, ep 24)
In 1990, thieves stole half a billion dollars in masterpieces from the Isabella Stewart Gardner Museum. Who orchestrated the infamous heist and why? (S4, ep 25)