"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."
"Accompanied by local experts, Graham compares ancient oral traditions and learns Sacsayhuam\u00e1n in Peru may be older than archaeologists ever imagined."
"Although thousands of miles apart, Graham considers the possible link between the shamanistic use of ayahuasca in the Amazon and tobacco in New Mexico."
