Built by General Motors Corp. and chemical company Rohm & Haas, which developed Plexiglas in 1933, this car made of the transparent substance appeared at the 1939 World's Fair in New York and the 1940 Golden Gate Exposition in San Francisco. Nicknamed the Ghost Car, the $25,000 (about $420,000 today) see-through sedan heralded the widespread use of the shatterproof acrylic glass in airplane cockpits, submarine periscopes, gun turrets, and more during World War II. After the war, its uses shifted from combat to consumer, including storm windows, skylights, bathtubs, and even dentures.