Harold Holt was the 17th prime minister of Australia when he went missing in December 1967. Many believed that he drowned, as he was last seen swimming on a deserted beach when the conditions were rather strong.
Today, Connie Converse is seen as one of the world’s first true singer-songwriters. However, she was relatively unsuccessful and unknown in the 1950s. She decided to start a new life in 1974 when she packed up her car and hasn’t been seen since.