Since part of my wonderfully misspent youth was spent looking around the world for lost mines and buried treasure - I found this (editted version of) article kinda cool:
In the 17th century a Scottish sailor, Alexander Selkirk, was a castaway on an island 2,000 kilometers to the west of what is now Chile. He was rescued some years later and one day in a pub in Scotland he told his story to Daniel Defoe, who later wrote the famous novel "Robinson Crusoe," based on the sailor's experiences....
Until now, the island was only known because of the Robinson Crusoe story and its delicious lobsters. But in 1995 an American named Bernard Keiser arrived on the island saying he had evidence that a considerable treasure had been hidden there at the beginning of the 18th century by a British captain named George Anson. In those days, British pirates frequently raided Spanish galleons and ports on the South American continent....
A few weeks ago Wagner, a Chilean geological prospecting company that was doing some work in the island, declared it had found by chance the area where the treasure is. It used a highly sophisticated robot invented in Chile that can detect different kinds of underground structures. The treasure is said to consist of 600 barrels of gold and jewels that today would be valued at US$10 billion. According to Chilean laws the amount must be shared in equal parts between the state and the finders. Of the island's 1,500 inhabitants, many do not believe that the treasure has been found.
No digging has been approved yet - so will update.
PS - Site is having technical problems.