Upphovsland: USA
1. The World Beneath Our Feet
Avsnitt 1 - The World Beneath Our Feet, Säsong 6
Humanity has launched satellites into outer space and submarines to the ocean floor, but the ground below Earth's surface remains shrouded in mystery.
2. The Time Travelers
Avsnitt 2 - The Time Travelers, Säsong 6
A look at whether time travel has already occurred, on purpose or by accident, and scientists who believe it is theoretically possible.
3. Secrets of Ancient Structures
Avsnitt 3 - Secrets of Ancient Structures, Säsong 6
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.
4. Mysteries of the Vikings
Avsnitt 4 - Mysteries of the Vikings, Säsong 6
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.
5. Strange Stories of the Presidents
Avsnitt 5 - Strange Stories of the Presidents, Säsong 6
There are many bizarre tales involving US Presidents that defy explanation and are still shrouded in mystery.
6. Tales of the Tormented
Avsnitt 6 - Tales of the Tormented, Säsong 6
Throughout history, tales of inexplicable maladies have stirred morbid curiosity - from mysterious wounds to a madness that compels people to dance.
8. Strange Technology
Avsnitt 8 - Strange Technology, Säsong 6
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.
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