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  1. www.pbs.org › wgbh › novaGround-Penetrating Radar Reveals Military Structures Buried ...

    Mar 4, 2019 · Alcatraz might be best known as a popular tourist destination, the site of the former high-security prison that once held Al Capone. But a team of archaeologists has now unveiled new evidence of ...

    • Was the Alcatraz prison buried beneath military fortifications?1
    • Was the Alcatraz prison buried beneath military fortifications?2
    • Was the Alcatraz prison buried beneath military fortifications?3
    • Was the Alcatraz prison buried beneath military fortifications?4
    • Was the Alcatraz prison buried beneath military fortifications?5

  2. www.nbcnews.com › mach › scienceScientists find Civil War-era fortifications buried under ...

    Mar 28, 2019 · Using ground-penetrating radar, archaeologists discovered structures from a mid-1800s military fortification buried beneath Alcatraz Federal Penitentiary. New research is another example of how ...

    • Science Reporter

  3. www.livescience.com › 64907-military-structureRadar Reveals 19th-Century Military Fortifications Beneath ...

    Mar 4, 2019 · Today, Alcatraz penitentiary, built in 1908, is a National Historic Landmark. So, de Smet and his colleagues decided to use noninvasive methods to locate the buried military fortifications. "We ...

  4. sf.curbed.com › 2019/3/6 › 18252874Civil War-era buildings discovered under Alcatraz prison ...

    Mar 6, 2019 · Civil War-era fortifications discovered under Alcatraz Ground-penetrating radar uncovers remains of 19th-century fort beneath prison yard By Adam Brinklow Mar 6, 2019, 10:10am PST

  5. www.bbc.co.uk › news › world-us-canada-47475564US Civil War-era tunnels and buildings found under Alcatraz ...

    Mar 7, 2019 · A new study has found US Civil War-era tunnels and buildings buried beneath the famed Alcatraz island prison in San Francisco, California. ... constructed atop US military fortifications built in ...

  6. www.technologynetworks.com › analysis › newsMilitary Structures Revealed Beneath Alcatraz | Technology ...

    Mar 8, 2019 · This unique, nondestructive research method revealed that remnants of buried structures, including a “bombproof” earthwork traverse along with its underlying vaulted brick masonry tunnel and ventilation ducts, ran east to west beneath the recreation yard of the Alcatraz penitentiary. de Smet said he was shocked to discover that the historical structures were maintained in such good condition.

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  8. apnews.com › article › san-francisco-north-americaArcheologists find hidden tunnels below Alcatraz prison

    Mar 6, 2019 · Published 3:14 PM PDT, March 6, 2019. SAN FRANCISCO (AP) — Archaeologists confirmed a long-time suspicion of historians and say that 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 ...