The 1953 Paxton Phoenix is a one-of-a-kind automotive prototype built by Robert Paxton McCulloch, the industrialist famous for McCulloch chainsaws and Paxton superchargers.  Styled by legendary designer Brooks Stevens, it was originally developed to run on an advanced steam power-train engineered by Abner Doble. The Phoenix would re-introduce steam power to the world! Sadly, the steam engine was never fully completed, the rear-engine prototype runs on a 1950 Porsche 356 motor featuring a rare Hirth crank.  The fiberglass-bodied car featured futuristic (for its era) details like an electrically retractable hardtop roof, a floating steering wheel design, and power door openers.
More pics and information here.