While looking up image reference one day, I stumbled upon an article on the Voynich Manuscript. I wasn't familiar with it when I found the article and images, but immediately wanted to know more.
The book is full of the most wonderful and strange drawings. The paper looks like tissue, and the writing throughout is indecipherable to date. It's been studied for decades, after being discovered by a book seller in 1912, and contains elements of botany, astrology and cosmology. It's believed that the manuscript was created in the early 15th century in Northern Italy.
You can find a full scan of the manuscript archived online.