Season 8

All over the world stand ancient structures so massive, precise, and baffling that they seem impossible for not just their time, but ours as well. From colossal walls and giant stone tombs to temples carved from solid rock, how did ancient civilizations achieve feats of engineering that still defy modern understanding?

Dreams have inspired humanity for thousands of years and in all this time, we have yet to answer one fundamental question: What is the purpose of dreams? From nightmares linked to unexplained deaths and more.

Throughout history, catastrophic disasters have reshaped civilizations -- yet some events defy all scientific expectations.

Africa remains one of the most mysterious continents on Earth. From lost cities buried beneath shifting sands, to the elusive tomb of history's most mighty queen, what secrets lie hidden throughout Africa's vast landscape?

The human mind is home to all our thoughts, hopes, dreams, and memories.

An exploration of strange and inexplicable mysteries; contributions from scientists, historians and witnesses as they seek to shed light on how the impossible can happen.

Every year, people risk their lives to enter places the world has marked off-limits. What is it about the world’s most dangerous places that makes them impossible to resist?