Oak Island, Canada
On this little island lives a legend of buried treasure: in 1795 a group of boys discovered a strange dip in the ground where all the trees had been cut away. After hearing tales of pirates, they began to dig and discovered layers of logs impossible to move. They returned eight years later (as have many explorers over the past 200 years) but the treasure is so well booby-trapped with complex tunnels filling with water that it remains deep, deep underground! The closest explorers have come was in 1976 with a camera, which revealed three chests and a skeleton before the underground cave collapsed. Yikes!