E1 - Once There Was a Flood

Aired: November 11, 2022

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

E2 - Stranger in a Time of Chaos

Aired: November 11, 2022

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

E3 - Sirius Rising

Aired: November 11, 2022

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

E4 - Ghosts of a Drowned World

Aired: November 11, 2022

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.

E5 - Legacy of the Sages

Aired: November 11, 2022

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

E6 - America's Lost Civilization

Aired: November 11, 2022

Graham visits ancient mounds in North America and wonders if they contain astronomical significance — or even warnings of an apocalyptic climate event.

E7 - A Fatal Winter

Aired: November 11, 2022

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

E8 - Cataclysm and Rebirth

Aired: November 11, 2022

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