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2,640 square millimeters is about 0.00000005 times as big as Windsor Castle.
In other words, it's 0.0000000500 times the size of Windsor Castle, and the size of Windsor Castle is 20,000,000 times that amount.
(Windsor, England) (total site area)
One of the official residences of the British monarch, Windsor Castle measures about 53,000,000,000 square millimeters. It is the largest inhabited castle in the world and is also the oldest in continuous use, having been occupied since it was built by William the Conqueror about 900 years ago.
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