Correction for the size of Windsor Castle
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How big is 1,110,000,000 square centimeters?
It's about two times as big as Windsor Castle
The size of Windsor Castle is about 530,000,000 square centimeters.
(Windsor, England) (total site area)
One of the official residences of the British monarch, Windsor Castle measures about 530,000,000 square centimeters. 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.