19. Hugh Hefner
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We can’t talk about huge mansions without including Hugh Hefner on our list. This mansion looks like something that’s taken out of a fantasy book since it resembles a castle. We should mention that this house is available for purchase but it does come with an enormous price tag of $100 million. If this castle-like mansion looks insane, then you need to get ready for what’s coming next! #13 and #9 are our favorites!