Secrets of the Dead - Season 16 (2015)

Dr. Kathleen Martinez searches for Cleopatra's lost tomb in a 35-meter deep underground shaft within a temple complex dating from the time of Cleopatra that's dedicated to the ancient Egyptian god Osiris and his wife the goddess Isis.

Follow a team of international scientists documenting an archeological sensation: the exploration of royal tombs beneath the ancient Mexican city of Teotihuacán. Despite many decades of research, not much is known about this long-lost society. When archeologists discover evidence of a sacrificial chamber beneath the famous Pyramid of the Feathered Serpent, they find the clues that may finally tell us who these mysterious people were.

A mining operation in Cerrejon, Northern Colombia revealed a treasure trove of fossils from animals that lived ten million years after the KT extinction that killed the dinosaurs. Surprisingly, enormous reptiles were dominate. Scientists investigate who was the apex predator of the era - Titanoboa, a quarter ton giant snake five times bigger than the largest anaconda, or a similarly giant crocodilian with an incredibly deadly bite force.