What are the most expensive cars in the world? If the past will be included, that will be the 1931 Bugatti Royale Kellner Coupe sold for $8,700,000 in 1987. However, that car is definitely not in this list because it is not available in the market today. Boys who had the money and opportunity would probably spend a small fraction of it on a collection of the rarest and most expensive cars for their Continue Reading →