Overview: 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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First Air Date: Nov 11, 2022Last Air date: Oct 16, 2024Season: 2 SeasonEpisode: 14 EpisodeRuntime: 35 minutesQuality: HDIMDb: 6.30 / 10 by 52 usersPopularity: 34.208Language: English