The famous racecar driver Mario Andretti has a net worth of $100 million. And to get that net worth he's raced many different kinds of cars all over the world – in fact, he's one of only two people ever to come in first place in races in Formula One, IndyCar, World Sportscar Championship and NASCAR. Andretti and his twin brother Aldo were both interested in cars from a very young age. Their mother claims that, amazingly, her young sons would sit in boxes and pretend to drive cars even before either of them had ever seen a car! Mario Andretti began to race in real cars not too long after, when the Andretti family moved to a place with a racetrack. From then on, Andretti demonstrated that he was a racer to watch, rising in the ranks of not just one racing organization, but several. He won championships in NASCAR, Formula One, and more, and competed in the Le Mans 24 Hour Race for four decades. Since retiring from racing, Mario Andretti has maintained a high profile, writing a column about racecar driving and making cameo appearances in TV shows such as Home Improvement and feature films such as Pixar's Cars and the racing documentary Dust to Glory.