Some of the world's famous relics have secrets behind them that contribute to their complete stories. Secrets explores the mysteries relating to some of these historic landmarks to reveal the truths behind them. The latest research and forensic techniques are used to find out the stories behind the fabled cities, monuments and remnants featured on the show. Episodes include Egyptian historians on a mission to decode the mysteries of the Great Sphinx, archeologists unearthing secrets of Richard III, and an investigation into whether the bust of Nefertiti is real or a hoax.