Bill Gates' da Vinci manuscript
Bill Gates' da Vinci manuscript

In 1994, Bill Gates bought something that not many can brag about: one of Leonardo da Vinci's manuscripts. He purchased the 72-page Leicester Codex for about $31 million in a Christie's auction.

Of course, thanks to a net worth estimated at $61 billion, the scientific manuscript isn't the only rarity in Gates' private collection. The second-wealthiest person on Earth is also known to collect art, including a Winslow Homer painting for which he paid more than $30 million.

By Erin Kim @CNNMoneyTech - Last updated June 22 2012: 5:16 AM ET
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