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| Aflevering | Eerste uitzending |
|---|---|
| S04E01 - Mayan Apocalypse | 03/09/2021 |
| S04E02 - America's Military Underground | 14/09/2021 |
| S04E03 - Murder Tunnels | 25/09/2021 |
| S04E04 - America's Ancient Ancestors | 28/09/2021 |
| S04E05 - The Pirate Queen's Lair | 05/10/2021 |
| S04E06 - Templars and the Founding Fathers | 12/10/2021 |
| S04E07 - Secrets of the Ancient Metropolis | 19/10/2021 |
| S04E08 - The Lost Aztec Colony | 26/10/2021 |