Citroen cars on three wheels

With models like the 2CV, DS and SM, Citroën established itself as a home for quirky styling and out-of-the-box engineering, and in many minds the brand defines the look of the classic French car. In a recent video, XCar ventures inside Citroën's secret warehouse outside of Paris where the brand keeps many of its rarest and most significant cars.

The collection includes the oldest DS in the world, which was never put on sale, and four incredibly rare, pre-World War II 2CVs. According to Denis Huille of Citroën Heritage, about 60 percent of the cars are in drivable condition.

Citroën is now starting to go through a stylistic reawakening. Concepts like the DS 5LS R, Wild Rubis and Numero 9 show off a brand that has a definite idea of how a car wearing its badge should look. Scroll down to take a tour through the company's history.