America's Lost Civilization

11th November 2022 33 mins Season 1 Episode 6

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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Season 1 · Episode 7

A Fatal Winter

The author returns to Turkey to explore Derinkuyu, an ancient underground city and survival bunker that could shelter thousands in times of crisis.

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