S8 E6 | Mighty Kingdoms Unearthed

Throughout civilization there are many kingdoms and mighty empires that have risen, only to one day fall. And for some of them-like the Inca that built Machu Picchu-their eventual demise remains a mystery. What can we discover from clues left behind by these once great empires? Could the Vikings, using their longships and traits as skilled navigators, have travelled farther into America than what we are led to believe?