This document lists the top 10 most expensive cars in the world. It provides details about each car such as their top speed, limited production numbers, and technology. Some of the most expensive cars include the Bugatti Veyron Super Sports, Pagani Zonda Cinque Roadster, Lamborghini Reventon, and Koenigsegg Agera R. These ultra-high performance cars cost over $1 million each and use advanced materials and engines.