From the Mercedes Gullwings of the 1950s to the Ford Mustangs of the 1960s, there are vintage cars to be found in all corners of the USA. And CNN reports, the value of vintage cars skyrocketed by 430% between 2005 and 2015 – making them an excellent investment as well as beautifully retro. And with luxury cars now taking up an estimated 6% of the US car market, many people are now combining two of their passions and searching for luxury vintage automobiles in which to invest. With that in mind, here are some of the best luxury cars from the history books.