Xanadu 2.0, Bill Gates' $130 Million Mansion, Tracks Residents.

Bill Gates is among those who have held the label "world's richest man" the longest.

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His twelve-figure net worth was propelled by the digital behemoth Microsoft Corp.,

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which the billionaire established. As one might expect from someone who founded one of the most ,

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successful software companies in history, he constructed his own home from the ground up.

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You are given a key when you enter the house that is preprogrammed ,

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with your preferences for everything from lighting and music to room temperature.

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The key keeps track of your movements, and as a safety precaution,

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if you are on the floor and no key is found, you will activate the alarm system.

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