When it comes to get-rich-quick schemes, finding Lake Toplitz Gold is high risk / high reward. During the 1940s, the German Navy used the isolated lake, located in the Austrian Alps, as a testing station. After the war, locals began exchanging British banknotes, and it came to light that they had found these washed up on the shores of Lake Toplitz.

It’s thought that that the Nazis dumped billions of dollars worth of stolen gold—in the area of $5.6 billion—into the lake. But be warned: the lake is 300 feet deep and can only be accessed via a mile-long dirt track. Nevertheless, divers have tried to recover the gold over the years, and five have died in the process - leading to speculation that someone, or something, still guards it…