Johnny Cash at San Quentin

On February 24th, 1969, two days before he turned 37, Johnny Cash led his traveling troupe behind the foreboding walls of the California State Penitentiary at San Quentin, long known as one of America's toughest prisons.On February 24th, 1969, two days before he turned 37, Johnny Cash led his traveling troupe behind the foreboding walls of the California State Penitentiary at San Quentin, long known as one of America's toughest prisons.