1936 Mercedes-Benz 540K Special Roadster – $9,680,000
This rare and classic Mercedes-Benz stood out in its day, an impressive relic of pre-war German engineering. Experts speculate that the car, which is more than 17 feet long and 6 feet wide, and has an 180-horsepower engine, could fetch up to $15 million at auction in mint condition. This one, however would need some TLC before it could hit the mark.