At the sacrificial alter, El Castillo, where thousands met their death, researchers find exciting new evidence. Can a sacred well at Chichen Itza, where thousands of Mayan victims were deposited shed new light on the Maya? Were they simply at the mercy of bloodthirsty Gods? Or was there great honor in being sacrificed? Ceramic pieces found at Khonkho Wankane mortuary prove these people stripped dead bodies of flesh using quicklime. Whatever was left, they carried with them as they moved with their herds. What can science tell about these ancient chemists and their solutions? How did they justify the literal weight of loved ones carried on their backs? The Xiongnu nomadic people's burial complexes protect not just the elite leaders, but shares new clues on their influence and control over the silk road...