BMW's Isetta was built on license from an Italian automaker. Today, it's the most popular microcar to collect. BMW produced over 160,000 Isettas from 1955 to 1962.

For our part, we'll tell you why this BMW 1-Series has a severely swollen rear end. The inflatable sphere hanging off the back is called the "Air Camper". According to Winding Road, which ...