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.
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