The Codex Sassoon, expected to soon become the most expensive historical document ever sold, heads to the auction block on May 16 at Sotheby’s. One would assume that the earliest and most complete Hebrew Bible in the world will be kept under lock and key until its sale. For a few days, however, and by appointment only, you can take a peek at the rarest book in the world before it fetches upwards of $30 million. —Lucy Horowitz