* Production numbers: Some cars were made in very limited quantities, perhaps only a handful or even a single example.
* Uniqueness: A car could be considered rare if it has unique features, modifications, or a specific history.
* Condition: A car's rarity can also be determined by its condition. A pristine, original example is more valuable than one that has been heavily modified or restored.
Here are some contenders for the title of "rarest car in the world":
* 1936 Bugatti Type 57SC Atlantic: Only four were built, and only two survive today. It's often considered the most expensive car in the world.
* 1939 Mercedes-Benz 540K Special Roadster: Only two were built.
* 1955 Ferrari 410 Superamerica: Only four were built.
* 1963 Ferrari 250 GTO: Only 36 were built, and they are consistently ranked among the most valuable cars in the world.
* 1967 Lamborghini Miura P400: Only 474 were built.
* 1994 McLaren F1: Only 106 were built, and it was the fastest production car in the world for 12 years.
* 2012 Pagani Huayra BC: Only 20 were built, and it is a track-focused version of the Huayra.
Ultimately, the "rarest" car depends on how you define rarity. But all of the cars mentioned above are extremely rare and highly sought-after by collectors.
