7Xanadu 2.0, Washington

Only Bill Gates can have a house named Xanadu 2.0. The massive 66,000 square foot home is known for its heavy-duty technology and ingenious design. This enviable, earth-shelter home has a complete underwater music set-up, a 1,000 square feet dining space, a large swimming pool, heated driveways – the works. Yeah, and plenty of ‘Windows.’ The property is currently valued at $125 billion.

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