Wolfsburg is a city in Lower Saxony, Germany. It is located on the River Aller northeast of Braunschweig (Brunswick). Wolfsburg is bordered by the districts of Gifhorn and Helmstedt. The city is very young, since it was planned by the Nazis in order to build a town for the workers of the Volkswagen factories. It was founded in 1938 as Stadt des KdF-Wagens ("City of the KdF Car") around the village of Hesslingen in the District of Gifhorn. Kraft durch Freude (abbreviated KdF and meaning "strength through joy") was the German state-controlled leisure organization; one of its projects was the KdF-Wagen, which would later be known as the VW Beetle. During World War II there were also jeeps, airplanes and other military equipment built, mainly by forced workers and POWs at these factories. After World War II, in 1945, the city got its present name after the Wolfsburg castle located in the city, which was founded about 1300 on the bank of the Aller river. Today there is another castle at the place, which was built after 1600. In 1951, Wolfsburg was separated from the District of Gifhorn, and became an urban district. In November of 2003, Wolfsburg was renamed Golfsburg for one week to celebrate the 5th generation of the Volkswagen Golf.