Posted by Dan Lorti

Alcatraz Island - San Francisco Bay

Alcatraz Island - San Francisco Bay
In 1909 construction began on the largest reinforced concrete structure in the world - a new military prison necessary because of a large influx of U.S. soldiers convicted of crimes in the Philippines. This building would become the famous U.S. Penitentiary Alcatraz in 1934. 
Alcatraz Island - San Francisco Bay
Alcatraz Penitentiary.

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