The 1957 Cadillac Eldorado Biarritz is a rare, luxury convertible, with only 1,800 units produced, featuring a 325-hp dual-quad 365ci V8, distinctive "batwing" air cleaner, and iconic, sharp tail fins. Priced at around $7,286 to $7,750 USD, it was one of the most expensive American cars of 1957, boasting premium amenities such as standard leather seats, a power top, and power windows.