A look back at Alcatraz

File - In this March 21, 1963 file photo the last prisoners depart from Alcatraz Island federal prison in San Francisco. The National Park Service on Thursday celebrated the 50th anniversary of Alcatraz Island's closure as a federal penitentiary with an exhibit of newly discovered photos of the prison's final hours. The new display opened five decades after the last shacked prisoners were taken off the infamous prison in San Francisco Bay that once held the likes of gangsters Al Capone and Mickey Cohen. (AP Photo/File)

March 21, 2013 4:15 pm  •