Editor's note: The story states that Western University Professor Andrew Nelson excavated at Chan Chan. In fact, he worked on material previously excavated at the site. In Peru, archaeologists have discovered an ancient burial site that had remained untouched for centuries until now. The mausoleum was hidden within an ancient city for 600 years. As Touria Izri reports, it's offering a rare glimpse into a civilization even older than the Incas.