Giant pyramids at a strange site in Mexico are revealing the bloody secrets of a mysterious civilization that vanished 1,400 years ago. Little is know about this lost culture, but new discoveries are uncovering shocking evidence of human sacrifice. This is Teotihuacan, one of the largest cities in the ancient world.

Recent forensic findings uncover the astonishing secrets of the world's most iconic monument, the great Sphinx at Giza. Join the extraordinary investigation as it reveals which pharaoh commissioned this colossal statue and why it was never finished.