Forbidden Knowledge: Prophecies, Portals and Time Machines

Scientists examine underground clues from over 250,000 years ago that raise questions about our early relatives — and what it truly means to be human.

A look at the origins, history and conspiracies behind the "Majestic 12", a clandestine group of military and corporate figureheads charged with reverse-engineering extraterrestrial technology.

Through deeply personal interviews with her siblings and an examination of the photographs, letters, and belongings left behind, Mariska assembles a new portrait of her mother Jayne Mansfield, an extraordinary and complex woman.

Al Pacino's deeply-felt rumination on Shakespeare's significance and relevance to the modern world through interviews and an in-depth analysis of "Richard III."

Over 35 years after Bob Lazar's revelations, this documentary exposes secrets of a facility the government still denies. Featuring Lazar's testimony, recreations, and new evidence, it reopens a case that continues to spark global curiosity

An astonishing journey revealing the awesome power of the natural world. Over the course of one single day, we track the sun from the highest mountains to the remotest islands to exotic jungles.

Film adaptation of French economist Thomas Piketty's ground-breaking global bestseller of the same name: an eye-opening journey through wealth and power.

Performance artist Marina Abramovic prepares for a major retrospective of her work at the Museum of Modern Art in New York.

This documentary delves into the mysteries surrounding the Neanderthals and what their fossil record tells us about their lives and disappearance.

Meet the growing, worldwide community of theorists who defend the belief that the Earth is flat while living in a society who vehemently rejects it.

A look at the "Hell House" performed annually in October by the youth members of Trinity Church (Assemblies of God) in Cedar Hill, Texas (a Dallas suburb) — seen by over 10,000 visitors each year.

A string of threatening emails escalates into a revenge plot involving a newly married US marshal and his ex-girlfriend.