What will first contact look like? The question has perplexed scientists and sci-fi writers for more than a century. Alien Encounters lays out a plausible hypothetical scenario for a first contact event.

Close Encounters explores the countless UFO sightings reported from regions around the globe. Most sightings can be accounted for by weather patterns, flight schedules or extraordinary imagination. But a select few are still considered unsolved extraterrestrial puzzles.

Oddities dives into the weird world of strange and extraordinary science artifacts through the eyes of the proprietors of New York's Obscura Oddities.

The Unexplained Files investigates bizarre occurrences that have confounded scientists and inspired legends. Join renowned scientists, credible experts and eyewitnesses as they present riveting never-before-seen footage and share their accounts of truly bewildering experiences.

Scientist Rob Nelson investigates the strangest underground locations in the world, using the latest technology and research to shed new light on the secrets that lie just beneath our feet.

Follow Digital Survivalist Andy Quitmeyer as he travels to remote parts of the world and hacks his way back to civilization using a hybrid of time-tested outdoor survival skills and a backpack's worth of wires, laptops and tracking devices.

Some of the world's most incredible engineering projects now lie in ruins. These deserted places are home to extraordinary mysteries and untold secrets, and we revisit them to understand how they were built, and why they were abandoned.

Explore the most startling disappearances of the modern era, looking at what we know happened that fateful day, what the theories behind their vanishing are – and what science can tell us about what really happened.

Dark Matters explores questions some say should not be asked. See stories of science on the dark and ragged edge of human understanding, where experiments can be ethically controversial and the results can be mind-blowing.

For thousands of years, alternative truths have been hiding in plain sight, locked away with secret codes and symbols whose meanings were known only to the initiated until now.

UFO CONSPIRACIES investigates the world's most intriguing and fascinating UFO sightings. It retells and reconstructs incidents from all over the world by seeking out first-hand eye-witnesses and listening to their accounts.

In this first-of-its-kind global series, an international task force led by the United States will use every sighting, declassified file, and every piece of evidence since the dawn of man from 24 different countries to answer one question: have extraterrestrials made contact?