15. Bugatti Type 41 Royale Kellner Coupe

Priced at $10 million, the Bugatti Type 41 Royale Kellner Coupe was first made during the Great Depression. Reports suggest that only three of the six of these grand machines have ever been sold. This amazingly engineered beauty made it to the list due to its 12.7-liter, straight-eight engine and top-class interiors.