Xanadu 2.0 Bill Gates house
It took Gates seven years and $63 million to build his Medina, Washington, estate, named "Xanadu 2.0" after the fictional home of Charles Foster Kane, the title character of "Citizen Kane."
At 66,000 square feet, the home is absolutely massive, and it's loaded to the brim with high-tech details.
We've rounded up some of Xanadu 2.0's most over-the-top features here.