15 most expensive cars sold at auction.

This is more a history lesson than anything else but some names are at least familiar, even if the models aren't. Click here to see the gallery and description, courtesy of Forbes magazine.

Pictured: A 1937 Mercedes Benz 150K Special Roadster which sold for US$3.6m in 2002.

Pictured below: A 1954 GM Futurliner which sold at auction for US$5.4m in 2006.