BMW Isetta

Designed back in 1953 by the Iso motorcycle plant, they were afraid to release the car on the assembly line due to marketing risks. However, soon, the world-famous company BMW acquired the rights to Isetta.
As a result, as many as 16,000 little cars were published. It was a success. The car turned out to be unique in many ways. For example, the only door (aka the front of the vehicle) was opened with a lever, while moving the steering wheel for a convenient passage for the driver.