Each one of the concept cars featured on this list has survived the test of time. They have proven themselves, and not only as showstoppers but as influential pieces of modern art. However, in the case of Cadillac’s Sixteen Concept car, most people think GM should put this car into a museum of modern art. In fact, they should be 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. The car was thoroughly modern yet felt classic and more in sync with those legendary Cadillacs of the ‘20s and ‘30s than with most contemporary models. The initial response was so good that Cadillac considered going into full-scale production, but unfortunately, nothing happened.