Top 10 Most Expensive Auction Items

Auction house Sotheby's announced Sept. 9 that it will sell a rare John James Audubon tome, Birds of America, and expect it to fetch between $6.2 million and $9.2 million — making it the world's most expensive book. Only 119 copies of the bird book — most of which exist in museums and libraries — remain. Here's a look at some other pricey auction items

Going Once, Going Twice ...

Most Expensive Manuscript

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Seth Joel / Corbis

Item: Leonardo da Vinci's Codex Hammer
Winning Bid: $30,802,500
Sold: 1994

As the ultimate Renaissance man, Leonardo da Vinci meticulously recorded his thoughts, musings and sketches in journals throughout his life. Of the 30 that remain, his most famous is the Codex Hammer, named for the British nobleman who acquired the 72-page journal in 1717. Three years after Bill Gates bought the historic diary, he released a digitally scanned version for all the world to enjoy.

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