Correction for the size of Alcatraz
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How big is 69,150 city blocks?
It's about 15,000 times as big as Alcatraz
The size of Alcatraz is about 4.10 city blocks.
(a.k.a. The Rock) (California)
Alcatraz Island measures 4.10 city blocks. 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.