The 1939 Pontiac Ghost Car was displayed in the 1939-1940 New York World's Fair. It was built on the chassis of a 1939 Pontiac Deluxe Six with the body made out of the newly invented plexiglass. The metal was given a copper wash and other harware was chrome plated. Any rubber, including the tires, where made in white. It was the first transparent car ever built.
The car was up for auction today by RM Auctions. I haven't been abler to find what it sold for, but pre-auction estimates were that it would fetch between $275,000 – $475,000.