With its prototype series of Astro concept cars, GM showed drivers a possible vision of a future that never fully arrived.

Some even influence the design language of future production models. Here are 10 of GM's finest concept cars, many of which you may never have laid eyes on before. All the concept cars here have ...

Concept cars are meant to show off new design ideas and technology. Most were never meant to go to market, but here are some ...

Cadillac, the luxury-vehicle division of General Motors, unveiled a new concept car at CES on Wednesday. Source: Cadillac The car, InnerSpace, is part of its Cadillac Halo Concept Portfolio.

The Pontiac GTO is widely recognized as the genesis of the American muscle car golden age, and now, we're taking a look at these classic GTO concept sketches.

With Chevy branding, this sports car would be the everyday ... on the map. (The GT concept is also technically a Vauxhall, as the brands are linked in GM's European strategy.) ...

While purely a concept at this stage, GM says a production version would likely carry a price tag of around $25,000. That would put the sports car in perfect fighting range with the likes of the ...

High style concept cars have retuned to auto show turntables ... On the lower fascia an Ultra Cruise, previewing future models with General Motors's latest hands-free driver assist system.