The Voynich Manuscript
The Voynich Manuscript is a manuscript that dates to the first half of the fourteenth century. Although the language utilized is entirely unknowable, it appears to be a code. And because it's a code, it might be possible to translate and interpret it.
A book trader bought the book in 1912, and the process of interpreting the manuscript got under way right away. Over a century later, the project is still going strong but making little real progress.
It was claimed in 2017 that the riddle had been cleared up, the text had been translated, and all was OK again.
That is, until a second person reviewed the project and found that the newly decrypted text made absolutely no sense. Making ensuring the message being translated has significance is one of the keys to breaking any codes. If not, you didn't truly decipher that code.
The text is more than just coded words; it has been an intriguing mystery for all this time. There were also pictures of naked ladies, strange creatures, and signs of the zodiac. It has been attempted to be cracked by code breakers from both world wars, but to no effect. In truth, dozens, if not hundreds, of attempts have been made over the years, but no accurate or widely accepted translation has been made.