Scientific investigation and CGI animation reveal the hidden secrets of iconic structures and monuments from around the globe, demonstrating how they were designed, built, used and, in some cases, lost and rediscovered. 　　S11 E1 - The Lost Empire of Palmyra 　　S11 E2 - Mystery of Egypt's Zodiac Temple: Secrets of Dendera 　　S11 E3 - Lost Tomb of Alexander the Great 　　S11 E4 - Sunken City...