Surrounded by a mysterious trench, only one Egyptian pyramid, the Pyramid of Lahun, was ever constructed to look like it floats on water. Using pioneering drone-scanning technology, experts decode the ancient secrets of the pharaoh Senusret II that are locked inside its hidden tunnels.

Deep in the Iraqi desert, the world's only ziggurat, the Ziggurat of Ur, towers over the remains of the first civilization ever known in human history, Sumer of southern Mesopotamia. Armed with pioneering satellite imagery, experts investigate the dark mysteries behind this massive, ancient structure.