Xanadu 2.0, Seattle, Washington
Photo: thepinnaclelist
This spectacular mansion belongs to the current richest man in the world, Mr. Microsoft, Bill Gates himself. He calls it Xanadu 2.0 and according to reports he paid $63 million to build, but it now is worth more than double that amount. It has approximately 66,000 square feet and is apparently stacked with technology in every aspect of the home. But did you expect anything less?