It's hard to know what to be more astounded by: the look of this crimson wraith or the fact that it's based on a Valiant chassis, with a Slant-6 and everything. Whatever reason you choose, Virgil Exner Sr's 1960 XNR (get it?) concept is stunning.

Aside from the dramatic Ghia-provided steel body, the XNR was no mere show pony, being tested up to 152 MPH thanks to it's NASCAR-spec engine. After the show circuit, the car lived an interesting life, avoiding crushing in the US by fleeing to Europe, and finally ending up in the hands of the Shah of Iran before heading to Pebble Beach in 2012.

Photo Credit: RM Auctions