| Name | First Aired | Runtime | Image | |
|---|---|---|---|---|
| S04E01 | Mayan Apocalypse |
September 3, 2021
|
42 | |
| S04E02 | America's Military Underground |
September 14, 2021
|
42 | |
| S04E03 | Murder Tunnels |
September 25, 2021
|
41 | |
| S04E04 | America's Ancient Ancestors |
September 28, 2021
|
41 | |
| S04E05 | The Pirate Queen's Lair |
October 5, 2021
|
60 | |
| S04E06 | Templars and the Founding Fathers |
October 12, 2021
|
60 | |
| S04E07 | Secrets of the Ancient Metropolis |
October 19, 2021
|
60 | |
| S04E08 |
The Lost Aztec Colony
series finale
|
October 26, 2021
|
60 |
No artwork of this type.
No artwork of this type.
No artwork of this type.