Buick Riviera Concept

For decades the Riviera was a leader in modern 2+2 coupe design. But that segment disappeared in the mid-'90s, and soon many other respected GM names like Oldsmobile, Camaro/Firebird and Bonneville bit the dust as well.

This concept debuted in Shanghai last year and much of its styling was penned from GM's design studios in China. The gullwing doors are always a draw, but the car looks like any other lifeless concept. The Riviera is still dead.