2. Rolls-Royce Sweptail
Price: $12.8 Million*
Okay, technically the Rolls-Royce Sweptail claimed the title of “the most expensive car in the world” in 2017. Problem is, Rolls-Royce did not officially confirm that number, which means that the next car on our list will take home the title. But, with an estimated $12.8 million, the one-off Sweptail outperformed the next-most-expensive vehicle with a jaw-dropping $5 million (if reports are true). The Rolls-Royce Sweptail took more than four years to develop at the 2017 Concorso d’Eleganza Villa d’Este before its debut.