When a special constable is stabbed to death outside her house, a botched robbery is suspected until police uncover shocking clues closer to home.
Follow Todd Standing, Dr. Jeff Meldrum and other researchers into the wilderness, where they try to capture definitive proof of Sasquatch's existence.
For two years, dozens of New Delhi children have gone missing. When police finally crack the case, two men are convicted, but details don't add up.
Skeptics and experts discuss photographs and other evidence that suggest the United States government faked NASA's moon landings for political gain.
For 13 years, the underground neo-Nazi organization NSU eluded German police while planting bombs, robbing banks and killing immigrants at random.
How was the scientific understanding of the ancients so advanced? A team of experts answers this and other questions in this fascinating series.
In an attempted heist worthy of a Hollywood film, a cadre of criminals sets out to steal the world's largest perfect diamond from a London landmark.
Skeptics and others discuss widely held conspiracy theories involving aliens, government cover-ups, secret assassinations and other intrigues.
This documentary digs deep to recount the saga of the superstar self-help guru convicted of negligent homicide in the deaths of three followers.
Declassified FBI documents trace an 11-year investigation of rumors that Hitler survived Germany's defeat in 1945, escaping via U-boat to Argentina.
Determined to bring the man responsible for their daughter's murder to justice, a Southampton couple embarks on a grueling five-year crusade.
Wildlife cameraman John Waters travels to the forests of the Pacific Northwest in search of the elusive cryptozoological specimen known as Bigfoot.
An attorney acting as "devil's advocate" interviews those who claim to share a personal relationship or mystical experiences with the Virgin Mary.
Never-before-aired NASA footage presents startling evidence that may finally answer the question: Is the moon a secret landing base for an alien race?
This documentary takes an alternative look at the assassination of President John F. Kennedy by focusing on the secret history of Lee Harvey Oswald.
This spellbinding documentary hosted by actor Jonathan Frakes deigns to go where few have gone before: to Roswell, New Mexico, to investigate so-ca...