It's not a "prototype" in the truest sense of the word — it's not a test run for a later production car. Instead, the Infiniti Prototype 9 Race Car is a one-off concept that reimagines a 1940s race car. While its steel body panels and steel ladder frame were built by hand using old-school manufacturing techniques, it's powered by an electric motor producing 148 hp. As a result, it can hit a top speed of over 100 mph and goes from 0-62 in just 5.5 seconds, but won't be of much use anywhere but the track, as its battery only lets it run for roughly 20 minutes at a time. For a firsthand glimpse, visit the 2017 Pebble Beach Concours d'Elegance.