Archaeologists have confirmed a long-held suspicion of historians and say that famed Alcatraz prison was built over a Civil War-era military fortification. Researchers have found a series of buildings and tunnels under the prison yard of Alcatraz Federal Penitentiary, which once held Prohibition-era gangster Al Capone, SFGate reports. A study published in Near Surface Geophysics, an international geophysics journal, says archaeologists used ground-penetrating radar, terrestrial laser scans and historical maps and photographs. (Eric Risberg/Associated Press)Historians believe workers built over existing structures when the prison was built early in the 20th century. During the Civil War, Fort Alcatraz was the military prison for the West Coast.

Source: CBC News March 06, 2019 22:37 UTC