Zerk's got it.
Yes, this is the famed 1947 Cadillac built by Louie Mattar into the ultimate non-stop endurance vehicle.
Assembled over a five-year period, the car made non-stop trips from San Diego to New York City - and back, and from Alaska to Mexico City.
For those not familiar with the story already, 'astounding' hardly begins to describe the effort. I'll let Hemmings fill in the details.