Correction for the size of Windsor Castle
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How big is 20,000,000,000 thousands of circular mills?
It's about one-fifth as big as Windsor Castle
The size of Windsor Castle is about 100,000,000,000 thousands of circular mills.
(Windsor, England) (total site area)
One of the official residences of the British monarch, Windsor Castle measures about 100,000,000,000 thousands of circular mills. 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.