#10 – The Voynich Manuscript
There are a variety of secret codes in the world that people have made up, but one that has continued to stump scholars is the Voynich Manuscript. Named after Wilfrid Voynich who purchased the book in 1912, the manuscript is believed to have been created in Italy during the 15th century. While there are pages missing from the manuscript itself, 240 pages of text, drawings and diagrams are still intact.
Many experts, including the most brilliant codebreakers from both World Wars, have attempted to decipher the Voynich Manuscript without much success. Needless to say, the theories surrounding the origin and the contents of the manuscript itself are quite staggering. Donated to Yale University in 1969, the manuscript remains to this day in the Beinecke Rare Book and Manuscript Library for others who want to try their hand at deciphering its contents.