The Mystery of Machu Picchu
- Episode aired Mar 25, 2024
History's Greatest Mysteries explore the top theories on what the purpose for the Incas building Machu Picchu.History's Greatest Mysteries explore the top theories on what the purpose for the Incas building Machu Picchu.History's Greatest Mysteries explore the top theories on what the purpose for the Incas building Machu Picchu.