Correction for the size of Windsor Castle
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How big is 16,500 square meters?
It's about three-tenths as big as Windsor Castle
The size of Windsor Castle is about 53,000 square meters.
(Windsor, England) (total site area)
One of the official residences of the British monarch, Windsor Castle measures about 53,000 sq. m. 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.