Civil War-era fortifications have been discovered just below the prison's recreation yard, a study shows.
from BBC News - Home US Civil War-era tunnels and buildings found under Alcatraz prisonhttps://https://ift.tt/2CakfVP
from BBC News - Home US Civil War-era tunnels and buildings found under Alcatraz prisonhttps://https://ift.tt/2CakfVP
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