The two images here are probably the most famous. On the left, Vitruvian Man, and on the right, Leonardo's studies of human embryos. Both of these photographs of Leonardo's notebooks were shot by Luc Viatour.
Microsoft founder Bill Gates owns Leonardo’s 72-page collection of scientific writings, which Gates named the Codex Leicester after he bought it in a 1994 auction for $30.8 million, making it the most expensive book ever sold. Gates has allowed it to be placed on public display once a year around the world.