17. Cadillac XP 840 Eldorado
Although the Cadillac XP-840 Eldorado was extreme in its appearance, everybody knew they would never produce it. However, it paved the way for the legendary 1967 Eldorado as well as the future of Cadillac design.
So if you look closely, you will see several design elements that Cadillac used in the late ‘60s and early ‘70s.