The Cadillac Sixteen is a concept car introduced by Cadillac in 2003, showcasing an extravagant and ultra-luxurious design with an imposing V16 engine. Unlike regular production models, the Sixteen served as a design and technology showcase, emphasizing large proportions and premium craftsmanship. It features a massive chassis, combining classic Cadillac styling cues with modern luxury elements. Though it never entered production, the Cadillac Sixteen remains an iconic example of Cadillac's vision for ultimate automotive luxury and size.