The Voynich manuscript is a handwritten book thought to have been written in the 15th or 16th century and comprising about 240 vellum pages, most with illustrations. The author, script, and language remain unknown; for these reasons it has been described as “the world’s most mysterious manuscript”.
Generally presumed to be some kind of ciphertext, the Voynich manuscript has been studied by many professional and amateur cryptographers, including American and British codebreakers from both World War Iand World War II. Yet it has defied all decipherment attempts, becoming a historical cryptology cause célèbre. The mystery surrounding it has excited the popular imagination, making the manuscript a subject of both fanciful theories and novels: numerous possible authors have been suggested for it.
Full Wikipedia article
Wikimedia Commons has a complete photo-series of all the surviving Voynich manuscript pages in numerical order, available here. !!!

The Voynich manuscript is a handwritten book thought to have been written in the 15th or 16th century and comprising about 240 vellum pages, most with illustrations. The author, script, and language remain unknown; for these reasons it has been described as “the world’s most mysterious manuscript”.

Generally presumed to be some kind of ciphertext, the Voynich manuscript has been studied by many professional and amateur cryptographers, including American and British codebreakers from both World War Iand World War II. Yet it has defied all decipherment attempts, becoming a historical cryptology cause célèbre. The mystery surrounding it has excited the popular imagination, making the manuscript a subject of both fanciful theories and novels: numerous possible authors have been suggested for it.

Full Wikipedia article

Wikimedia Commons has a complete photo-series of all the surviving Voynich manuscript pages in numerical order, available here. !!!