Taman Shud Case / Somerton Man
https://secure.wikimedia.org/wikipedia/en/wiki/Taman_Shud_Case
"The Taman Shud Case, also known as the "Mystery of the Somerton Man", is an unsolved case revolving around an unidentified man found dead at 6:30a.m., December 1, 1948, on Somerton beach in Adelaide, Australia.
Considered "one of Australia's most profound mysteries", the case has been the subject of intense speculation over the years regarding the identity of the victim, the events leading up to his death and the cause of death."