Episode 1
From ancient footprints to mysterious earthworks, Graham continues his journey into the past alongside experts and curious minds, including Keanu Reeves.
Episode 2
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.
Episode 3
Accompanied by local experts, Graham compares ancient oral traditions and learns Sacsayhuamán in Peru may be older than archaeologists ever imagined.
Episode 4
Graham learns of a stone-shaping technique now lost to history, and explores how ancient Amazonians managed to thrive in an inhospitable rainforest.
Episode 5
Although thousands of miles apart, Graham considers the possible link between the shamanistic use of ayahuasca in the Amazon and tobacco in New Mexico.
Episode 6
At Mexico's Temple of the Sun, Graham experiences the extent of the Mayans' astronomical expertise and investigates their complex calendar system.
