Correction for the size of Alcatraz
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How big is 430,000 square feet?
It's about half as big as Alcatraz
The size of Alcatraz is about 960,000 square feet.
(a.k.a. The Rock) (California)
Alcatraz Island measures 960,000 square feet. It is known a part of the Golden Gate National Recreation Area, and has historically served as a lighthouse, fort, military prison, and — most famously — a federal prison.