The National Park Service marked the 50th anniversary of the closure of the Alcatraz federal penitentiary on Thursday with an exhibit of recently discovered photographs of the prison's final day on March 21, 1963.

Tours of the Golden Gate Bridge inaugurated during its 75th anniversary in 2012 are back for a second season starting April 1, 2013.

Alcatraz Island, which hosted its last inmate 50 years ago today, was also home to prison workers and their families who returned to the island this morning to mark the anniversary and recount their lives there.

Thursday is a red-letter day in the history of Alcatraz Island - the 50th anniversary of the day the prison closed. It was the end of one era and the beginning of another.

Over a million visitors tour Alcatraz every year, but a recent discovery has revealed another attraction that lives within the shadows of this historical prison: glowing millipedes of Alcatraz.