Season 1 · Episode 6
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America's Lost Civilization
Fri, Nov 11, 2022
·
33 min
Graham visits ancient mounds in North America and wonders if they contain astronomical significance — or even warnings of an apocalyptic climate event.
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Fri, Nov 11, 2022
33 min
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Ancient Apocalypse
14 episodes
Episode
S1 · E6
in Ancient Apocalypse
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S1 · E7
A Fatal Winter
Fri, Nov 11, 2022