There are plenty of icons built in America, such as the Corvette and the Viper, but there have been a lot of real exotics that got through the cracks along the way. Some were dragged off by poor timing, others by bankruptcy, and a few simply vanished before most people ever knew they existed. Whether they were hand-built supercars or one-off prototypes, these little-known vehicles showed the nation was up to the challenge of its European rivals. Take a trip down memory lane to revisit a few American exotics that are virtually forgotten.