The Voynich Manuscript
The Voynich is a hand made manuscript from the 14th Century. It was bought by an art dealer named Voynich in early 20th century.
This manuscript is a total mystery. Nobody knows what is is about. The text was written with an unknown alphabet that searchers are trying to decipher. Some of the hypothesis concerning the manuscript, consider it being a treaty of medicine or of plants, or the work of some one from another planet.