Held in Scottsdale, Arizona, the 2013 edition of the famed Barrett-Jackson auction sold off some of the world's greatest machines to ever take to the roads.
The notable cars to be sold at the auction include a 1956 Chrysler Diablo Concept ($1.375M), the first production example of the 2014 Chevrolet Corvette Stingray with Chassis Number One ($1.1M), a 1986 Porsche 959 Prototype ($440,000), a 1966 Batmobile from the original series ($4.620M) and even former President George W. Bush's personal F-150 which was sold off for charity ($300,000).
One extremely rare car wasn't sold, however: a 1968 Shelby EXP 500. An experimental car (hence the EXP name), the EXP 500 had some unique touches like fuel injection, disc brakes as well as fully independent rear suspension. Unique as it is and internally called 'The Green Hornet', it still didn't sell, even though there was a bid for $1,800,000.