Seasons & episodes
S1 · E1Once There Was a Flood 2022-11-11 · 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.
S1 · E2Stranger in a Time of Chaos 2022-11-11 · 33 min
In Cholula, Mexico's oldest continuously-inhabited city, the journalist inspects the world's largest pyramid for signs of a forgotten past.
S1 · E3Sirius Rising 2022-11-11 · 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.
S1 · E4Ghosts of a Drowned World 2022-11-11 · 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.
S1 · E5Legacy of the Sages 2022-11-11 · 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.
S1 · E6America's Lost Civilization 2022-11-11 · 33 min
Graham visits ancient mounds in North America and wonders if they contain astronomical significance — or even warnings of an apocalyptic climate event.
S1 · E7A Fatal Winter 2022-11-11 · 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.
S1 · E8Cataclysm and Rebirth 2022-11-11 · 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.
S2 · E1Chapter I 2024-10-16 · 42 min
From ancient footprints to mysterious earthworks, Graham continues his journey into the past alongside experts and curious minds, including Keanu Reeves.
S2 · E2Chapter II 2024-10-16 · 41 min
Graham searches for answers to the questions behind ancient works of art, including 25,000-year-old Amazonian paintings and the megaliths of Rapa Nui.
S2 · E3Chapter III 2024-10-16 · 39 min
Accompanied by local experts, Graham compares ancient oral traditions and learns Sacsayhuamán in Peru may be older than archaeologists ever imagined.
S2 · E4Chapter IV 2024-10-16 · 41 min
Graham learns of a stone-shaping technique now lost to history, and explores how ancient Amazonians managed to thrive in an inhospitable rainforest.
S2 · E5Chapter V 2024-10-16 · 41 min
Although thousands of miles apart, Graham considers the possible link between the shamanistic use of ayahuasca in the Amazon and tobacco in New Mexico.
S2 · E6Chapter VI 2024-10-16 · 40 min
At Mexico's Temple of the Sun, Graham experiences the extent of the Mayans' astronomical expertise and investigates their complex calendar system.