An investigation using sightings, declassified files and a task force led by the US, tries to answer one central question - have extra-terrestrials made contact?

Could there be life beyond our planet? Extraordinary NASA footage and ground-breaking interviews with astronauts and scientists investigate potential sightings of UFOs.

Could there be life beyond our planet? Extraordinary NASA footage and ground-breaking interviews with astronauts and scientists investigate potential sightings of UFOs.

Could there be life beyond our planet? Extraordinary NASA footage and ground-breaking interviews with astronauts and scientists investigate potential sightings of UFOs.

From volcanoes and galactic mega storms to mineral rich asteroids and comets. Discover how these titanic forces and extraordinary phenomenon could reveal clues about the origins of life on Earth and elsewhere in the universe.

From volcanoes and galactic mega storms to mineral rich asteroids and comets. Discover how these titanic forces and extraordinary phenomenon could reveal clues about the origins of life on Earth and elsewhere in the universe.

Discover the truth behind one of society's most clandestine institutions. Hidden within these bordellos are secrets about famous patrons, governments, and even religion.

Stunning 'blow apart' CGI animation and the latest archaeological investigations reveal how the most iconic buildings of the ancient worlds were built, stone by stone.

Ever wondered how a Porsche 911 was made? Join the How It's Made crew as they go to its birthplace, explore the inner workings and its gorgeous exterior.

Ever wondered how a Porsche 911 was made? Join the How It's Made crew as they go to its birthplace, explore the inner workings and its gorgeous exterior.