From Online Colleges.com, a list was made of the world's most valuable and rarest books.  The first book you'd likely think of is the Bible--and you'd be right.  Here are the top 3 known literary treasures and how much they are worth.

1. The Gutenberg Bible. In 1456, the Gutenberg Bible was the first book ever printed with moveable type. About 180 versions are believed to have been printed originally. Many of the remaining Bibles have been broken down into sections. Only 21 are believed to be completely intact. A fully-intact Gutenberg Bible is valued at $25-35 million.

2. Codex Leicester. This 72-page notebook contains the scientific writings and sketches of Leonardo da Vinci. In 1717, Thomas Coke, who was named the Earl of Leicester, bought the notebook. It was bought from the Leicester estate in 1980 and renamed Codex Hammer, after the art collector who purchased it. In 1994, Bill Gates purchased the notebook for $30.8 million and renamed it Codex Leicester. Gates’ purchase of this notebook made it the most expensive book ever sold.

3. First Folio. The first edition of Shakespeare’s plays, published in 1623, is widely considered one of the most important books in the world. This first published work by Shakespeare contained 36 of his plays and was 900 pages long and was published seven years after Shakespeare died. In 2008, a British man was accused of stealing one of the 228 remaining copies of the First Folio, that copy’s worth being estimated at £15 million, or about $22.6 million.

To see the rest of the world's top ten most valuable books, click here.