The Mounds of Cahokia dwarf the pyramids of Giza, but who built them and how? A discovery of a mass grave of female virgins could hold the answer. In 1922, Howard Carter made a great discovery in the history of archaeology: the tomb of Tutankhamun. Now, in the most fascinating tomb from Ancient Egypt, an ever greater discovery is about to be made: possible secret doorways in his tomb. Queen Nefertiti could lie in a hidden chamber behind these walls.