A little more than two years ago, the '36 Bugatti Type 57C Atlantic became known as the "most expensive car in the world," after it sold for more than $30 million. It is believed that only two remain today. The car was based on the '35 Aerolithé concept and maintained many of the stand-out features, including that well-known seam that runs from the nose, through the windshield and all the way to the boot.