From its growling engine to its unmistakable body, the Mustang is arguably the most iconic car in U.S. history. Spearheaded by the late Lee Iacocca in the early 1960s and entered into America's imagination in 1964, six generations of Mustangs have since rolled off the line in almost as many decades. Over the years, the brand has had its icons and failures — we've yet to see how the Mustang Mach-E will turn out as the first electric vehicle with the branding — but one thing has never changed: The Mustang is America's muscle car. (It's also the last remaining passenger car made by Ford for North America.) Here's a roundup of its best.