Why It's Important: Most Poster-Worthy Lamborghini

If the Countach was the 1970s in super car form, the Diablo was a perfect example of car design in the late 1980s and early 1990s. Almost impossibly wedge-shaped, the Diablo served as Lamborghini's flagship from 1990 to 2001, although we'd argue the most desirable examples are the pre-facelift cars, which featured pop-up headlights. Pop-up headlights are always better. But regardless of which year we're looking at, the Diablo is the last of the pre-Volkswagen Group Lamborghinis, for better or worse.