A 19th-century military fortification was bulldozed over so that the Alcatraz Penitentiary could be built, and the remains of the fort are still there, underground, according to a new radar analysis of the site.
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from Innovation and Digital Marketing https://www.livescience.com/64907-military-structure-under-alcatraz.html?utm_source=rss&utm_medium=rss
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