Scientists, historians and archaeologists attempt to unravel the greatest mysteries of history.
Pyramids: The Pyramids of Giza are the only surviving wonder of the ancient world, becoming a UNESCO World Heritage Site in 1979. But what truths are they hiding? (S1, ep 1)
Holy Grail: For centuries, the Holy Grail has been an object of mystery and fascination, with ties to the Last Supper and the crucifixion of Jesus Christ. (S1, ep 2)
Ark of the Covenant: This ornate, gold-plated chest housed the 10 commandments given to Moses by God and is said to have been built some 3,000 years ago. (S1, ep 3)
Explore the huge Nazca lines that were made over 2,000 years ago and are still a mystery to researchers today. (S1, ep 4)
With unimaginable wealth and power, Cleopatra was once of the most iconic figures of the ancient world. But what is the truth behind her mysterious character? (S1, ep 5)
The 'lost' island subcontinent, often idealised as an advanced, utopian society with the wisdom to bring world peace, has captivated dreamers for generations. (S1, ep 6)
Believed to have been constructed by the Mayan community roughly 1,500 years ago, the world-famous structure has fascinating secrets to tell. (S1, ep 7)
Bermuda Triangle: With a famous reputation for mysteriously swallowing boats, ships and even planes, the Bermuda Triangle has haunted tales for generations. (S1, ep 8)
Was Genghis Khan really buried in an unmarked grave? And was anyone who knew its location killed to keep it a secret? (S1, ep 9)
Were these fascinating skulls carved thousands of years ago by an ancient civilisation? Or are they proof that extraterrestrials visited the Aztecs? (S1, ep 10)
Hundreds of years ago, a small group of Polynesians rowed across the open sea, navigating by the stars. But when - and why - did they leave their native land? (S1, ep 11)
The prophecies of Nostradamus, from the French Revolution to the rise of Adolf Hitler, have long piqued interest - and according to him, the world will end in 3797. (S1, ep 12)