By Jillian Anthony @CNNMoney June 20, 2014: 6:50 AM ET
Bill Gates
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Where he lives: Computer pioneer and billionaire Bill Gates gives away millions to charity every year, and he also splurges on himself now and then. His 66,000-square-foot mansion on Lake Washington in Medina, Wash., features its own movie theater, library and a massive gym. The estate, which cost $63.2 million to build, is valued at more than $120 million today.