6. 1928 Mercedes-Benz S-Type 26/180 Sports Tourer
Ideal for both race and road tracks, the 1928 Mercedes-Benz S-Type 26/180 Sports Tourer is priced at $5 million to $6 million. Only 150 units of this rare beauty had ever been produced, out of which only a few survived to witness the luxurious demands of the 21st century.