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6. "Palazzo di Amore" was built for parties, with an entertainment complex and ballroom, private-label vineyard, and parking garages for more than 150 cars.

Price: $129 million

The home's owner, Jeff Greene, made a fortune when the real estate bubble burst in Greece and is worth about $3.4 billion, according to Forbes. It has 12 bedrooms, 23 bathrooms, and a 5,000-square-foot master suite. 

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