The UnXplained

Humanity has launched satellites into outer space and submarines to the ocean floor, but the ground below Earth's surface remains shrouded in mystery.

A look at whether time travel has already occurred, on purpose or by accident, and scientists who believe it is theoretically possible.

Age-old mysterious ruins stand as silent sentinels from the past, with their true history seemingly erased by time. Modern archaeology attempts to unravel the enigma of how and why the ancient structures were built.

During the Middle Ages, the Vikings were infamous for being a bloodthirsty band of seafaring warriors. Historians are learning surprising new things about this Norse society.

There are many bizarre tales involving US Presidents that defy explanation and are still shrouded in mystery.

Throughout history, tales of inexplicable maladies have stirred morbid curiosity - from mysterious wounds to a madness that compels people to dance.

There are many puzzling artefacts from around the world that challenge everything known about the technological capabilities of distant ancestors. Some ancient objects are so mysterious they've spawned endless debate and theories.

There's nothing more fascinating than a code that can't be cracked. For centuries, mankind has devised ingenious ways to hide valuable information, using everything from enigmatic puzzles, to complex ciphers and secret symbols.

During World War II, a number of persistent mysteries were born, including unexplained stories about everything from lost gold to secret societies and highly advanced technology.

Since the dawn of humanity, tales of monstrous creatures lurking in the shadows have sparked both fascination and fear. We explore the potential that these stories have elements of reality to them.