"Frank Sinatra and his third wife, Mia Farrow, are photographed on their wedding day in Las Vegas, July 19, 1966. The ceremony took place at the Sands Hotel, a famed Rat Pack haunt, where Sinatra’s close friend Jack Entratter served as best man. At just 21 years old, Farrow was 30 years Sinatra’s junior, making headlines as the youngest woman ever to marry the iconic crooner. Their brief, high-profile union—amid the glare of Hollywood and political press—reflected the turbulence of the 1960s, la