15. 1957 Ferrari 625 TRC Spyder

Price: $6.5 million
Auction: RM Auctions Monaco 2012

Ready for some simple math? Make your ball into a fist. Now, bring up your pointer finger, then your middle finger, and you're looking at how many 1957 Ferrari 625 TRC Spyders were ever created. One, two, and that's it, making this one of the rarest cars on the planet. With that in consideration, the $6.5 million paid for this car doesn't seem as unreasonable.

Like a true champion, this prancing horse won the very first time it hit the track. When it sold earlier this year, it was the first time this particular model was up for auction in 30 years. Under the hood is one of the smallest V12s ever fitted into a vehicle cranking out 320 horsepower (compare that to the 562-horsepower V8 in today's 458 Italia). It is in full running order and has been meticulously kept, both cosmetically and mechanically. If the owner is daring enough to actually take this car on the road, a recent engine rebuild and a new set of cylinder heads installed are sure to keep this engine purring.