Cadillac Sixteen Concept
Each concept car on this list has survived the test of time. They have proven themselves as showstoppers as well as influential pieces of modern art. However, in the case of the Cadillac Sixteen Concept car, GM should put this car into a museum of modern art. They could exhibit it as one of the most elegant creations of the early 21st century.
Cadillac unveiled the Sixteen Concept in 2003 as a super luxury sedan with a V16 engine under the butterfly-opening hood. Although the car was thoroughly modern, it felt classic and more in sync with those legendary Cadillacs of the ’20s and ’30s than with contemporary models. The initial response was so promising, Cadillac considered full-scale production, but unfortunately, nothing happened.