23: Buick Cielo
You have to admire Buick’s perseverance as the Signia didn’t stop the company from designing concepts. The next year, the Cielo hit the scene and was far better received. The Cielo was a more put-together sedan than the previous year’s concept car was. GM was looking to focus Buick on a younger demographic than those who had purchased their cars in years prior. The Cielo took its cues from the classic Buicks of yesteryear as evident by its waterfall grille.

From a design standpoint, the rollercoaster body sides were very different than anything else. Nowadays, panoramic sunroofs are standard equipment, but back when this concept hit there were none. Few Buick concept cars have managed to look as strange as the Cielo did, which is probably why it never hit production.