Subscribe to watch full natural history and science documentaries! A new documentary is uploaded every week. Facebook: www.facebook.com/thesecretsof... Twitter: twitter.com/NatureUniversum It is the world's most mysterious manuscript. A book, written by an unknown author, illustrated with pictures that are as bizarre as they are puzzling -- and written in a language that even the best cryptographers have been unable to decode. No wonder that this script even has a part in Dan Brown's latest bestseller "The Lost Symbol".