1. Once There Was a Flood

6.5

. 11 November 2022. 31 min

Graham visits Gunung Padang, an Indonesian archeological site, to find proof of a lost civilization — and the potential cataclysm that wiped it out.

2. Stranger in a Time of Chaos

6.6

. 11 November 2022. 33 min

In Cholula, Mexico's oldest continuously-inhabited city, the journalist inspects the world's largest pyramid for signs of a forgotten past.

3. Sirius Rising

6.6

. 11 November 2022. 31 min

Graham discovers a fascinating pattern that may connect the spectacular megalithic temples of Malta, which he believes to be much older than reported.

4. Ghosts of a Drowned World

6.6

. 11 November 2022. 30 min

Few scholars have investigated the Bimini rock formation off the coast of Miami, once fabled to be the road to Atlantis — but Graham dives right in.

5. Legacy of the Sages

6.4

. 11 November 2022. 32 min

At Göbekli Tepe, the oldest known megalith in the world, Graham questions if simple hunter-gatherers alone could have built such an advanced structure.

6. America's Lost Civilization

6.6

. 11 November 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.

7. A Fatal Winter

6.6

. 11 November 2022. 29 min

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

8. Cataclysm and Rebirth

6.6

. 11 November 2022. 32 min

In the ancient geological sites of North America, Graham envisions an apocalyptic event that may have changed the Earth — and its inhabitants — forever.