Secrets - Season 2 (2014)

Off the coast of North Carolina, nautical archaeologists, historians and scientists study the artifacts of a 300 year old shipwreck. Positively identified as Blackbeard's flagship, our investigators set about to uncover what the ship's remains can tell us about history's most notorious pirate.

The hunt for the truth about the most famous lost treasure of them all. Did the Ark of the Covenant really exist? What it did look like? What was the power that it was said to hold? And what happened to it? Where is it now?

In a search that spans four countries and 20 centuries, we investigate the legend of the Spear of Destiny. First mentioned in the New Testament, the spear is said to have pierced the side of Jesus. Believed to have special powers, kings and conquerors from Charlemagne to Hitler tried to possess it.

The Great Wall of China is more than just a part of history, it's part of the world's geography, a sprawling, massive edifice of mud, reeds, and billions of bricks. But why did the Chinese go to such lengths to build it? And what secrets have enabled it to survive for over 2,000 years? We unravel its mysteries and rewrite its complex history through groundbreaking science and pioneering drone technology. This is how the wall was built, what its real purpose was, how it has survived multiple earthquakes and attacks, and how long it really runs.