New evidence is revealing the dark secrets of relics unearthed from archaeology sites in China, and using the latest science and cutting-edge tech, experts might finally answer some of the greatest mysteries of long-lost Chinese civilizations. This is a mashup of S02E08 "Treasures of the Terracotta Army" and S04E04 "Secrets of the Forbidden City."

A strange site called Saqqara is home to Egypt's very first pyramid, the Step Pyramid of Djoser, and here, experts use cutting-edge tech to reveal why the ancient Egyptians started building pyramids and if the mummified animals found here are evidence of a bizarre religious cult.