Researchers found a series of buildings and tunnels under the prison yard of Alcatraz Federal Penitentiary, which once held Al Capone, SFGate reported Tuesday.

Alcatraz is known first and foremost as a prison. Hollywood has helped drag out this narrative with flicks about what might have been the only successful escape, and a hostage situation with ...

SAN FRANCISCO (KPIX) -- A new study has confirmed that there are historic hidden buildings and tunnels underneath the prison yard at Alcatraz Island. Historians have long suspected that when ...

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 ...

A web of tunnels have been found under the grounds of Alcatraz Federal Penitentiary, but they were not used by prisoners who were trying to escape. Rather, experts say the tunnels and other buried ...

Alcatraz is known first and foremost as a prison. Hollywood has helped drag out this narrative with flicks about what might have been the only successful escape, and a hostage situation with ...

SFGate reports researchers have found a series of buildings and tunnels under the prison yard of Alcatraz Federal Penitentiary, which once held Al Capone. SOURCE: AP Photo/Eric Risberg Updated: 2: ...

Archaeologists confirmed a long-time suspicion that the famed Alcatraz prison was built over a Civil War-era military fortification. ... Hidden tunnels existed below Alcatraz prison ...