Billionaires

9505 Gloaming Drive in Beverly Hills, California is one of the most expensive luxury rentals in the world—perhaps because it has room for your own personal car museum.

In 2006, billionaire Ingvar Kamprad revealed that he stayed rich by driving an old, used car and collecting salt and pepper packets from restaurants.

The idea of the self-made man is integral to the American dream: It's the belief that anyone—regardless of their circumstances—can achieve greatness through hard work, grit, and determination. Here are some of the world's greatest self-made men.

Maybe money does grow on trees. How else would explain why anyone would spend this kind of money on these items?

Some built tech empires, while others inherited massive wealth. Jump in and see how many you can identify correctly with this billionaire guessing game that puts your knowledge to the test.

Some billionaires work really hard and build their wealth from the ground up, others win the DNA lottery and inherit a huge amount of money from their parents, who happen to be billionaires. Let's look at how some of the world's youngest billionaires acquired extraordinary wealth.