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Alcatraz Island is seen in San Francisco on March 6, 2019. Archaeologists have confirmed a long-time suspicion of historians: the famed Alcatraz prison was built over a Civil War-era military fortification. Eric Risberg/AP Photo
SAN FRANCISCO—Archaeologists confirmed a long-time suspicion of historians and say that the famed Alcatraz prison was built over a Civil War-era military fortification.
Researchers found a series of buildings and tunnels under the prison yard of Alcatraz Federal Penitentiary, which once held Al Capone, SFGate reported on March 5.