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Once There Was a Flood

Episode number: 1

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

Stranger in a Time of Chaos

Episode number: 2

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

Sirius Rising

Episode number: 3

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

Ghosts of a Drowned World

Episode number: 4

Overview: 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.

Legacy of the Sages

Episode number: 5

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

America's Lost Civilization

Episode number: 6

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

A Fatal Winter

Episode number: 7

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

Cataclysm and Rebirth

Episode number: 8

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