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.
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