Prison built over Civil War-era military fortification
A study published in Near Surface Geophysics last week said archaeologists used ground-penetrating radar, terrestrial laser scans and historical maps and photographs.Historians believe that workers built over existing structures when the prison was constructed in the 20th century.
Alcatraz first came to the attention of the US government after it wrestled control of California from Mexico in the 1840s. It is now a major tourist attraction with ferries every 15 minutes from the mainland and visitor numbers of 1.7 million each year. – AP
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