Here s one hell of a conceptual design: the Cadillac World Thorium Fuel concept. Otherwise known as the Cadillac WTF. It was created by Loren Kulesus. Everything about the aptly named WTF has been created to last for 100 years without maintenance.
The Dubai makers of the Devel Sixteen hypercar claims their machine has a crazy times more than the Bugatti Veyron!) offering an unheard of performance; with a top speed of in just seconds! spon Watch it here.