Aristotle Onassis – Skorpios, $142 Million
Aristotle Onassis is a Greek shipping magnate who was one of the first millionaires who acquired a private island. In 1968, he bought Skorpios Island. Upon his untimely passing in 1978, it was turned into a part of the inheritance of his kids. In 2013, his granddaughter Athina sold it to Ekaterina Rybovleva for the price of $150 million. He had been married to Jackie Kennedy at the time of his death.