The one-of-a-kind 1957 Chrysler Diablo concept car is unlike anything I've ever seen. It's a long sleek convertible which will be auctioned off at Monterey's famed classic car weekend this August by RM Auctions. The Diablo is one hot devil car, note the little pitchfork on the side . It was conceived by Chrysler's design head, Virgil Exner and built by Italian coachbuilder Ghia on a 1955 Chrysler 300 series chassis and Chysler invested over $250,000 in the project back then. It was a featured concept car for the 1957 US auto show circuit. At 22 feet in length this one must be a little difficult to take around corners. The car has been in the care of one owner for 25 years. It is estimated to sell for $2.5 to $3 million.

The ultra-rare Diablo will join several other European styled sports and racing cars and several classic American luxury automobiles at RM Auctions' Monterey auction "We have assembled the greatest collection of sports and classic cars ever brought together on the Monterey Peninsula," said Ian Kelleher, Managing Director of RM Auctions. "The Diablo is simply the holy grail of all concept cars in its era. Its upcoming auction in Monterey has received considerable international interest due to its rarity and the fact that concept cars are a featured highlight of this year's world famous Pebble Beach Concours d'Elegance," he added.

Admission to the Sports & Classics of Monterey is $40 per person and an auction catalog is available for an additional $100 including shipping and handling within North America.