8. Buick Wildcat Concept
One of the first and currently unaccounted classic Detroit concept cars was the gorgeous 1953 Buick Wildcat. They made just two cars, white and black. Despite being similar, these two cars were not identical. Buick presented the first car in the lobby of the Waldorf Astoria Hotel. It was a black elegant roadster that gained much public attention. The white one was a later car they featured afterward. There are even rumors of a third car they painted green, but no one has been able to confirm that as fact.

The location of the first, black Wildcat is unknown. There were no reports of it being sold, scrapped, or reappearing anywhere in North America. However, there was a story of a black 1953 Wildcat concept in the garage of a GM employee who saved it from the crusher. They bought it for next to nothing a few years after the car retired from car shows. Someone allegedly saw the car in the late 1960s. There were even a few photos of the owner and the car, but even the best automotive historians and collectors cannot confirm anything.