August Horch Museum, Zwickau
One of Germany's best automotive museums, housed in the original Audi factory. Covers the full history of Auto Union, DKW, Horch, and Wanderer — the four rings that became Audi. Includes pre-war racing cars, the legendary Silver Arrows, and the story of the Trabant (also built in Zwickau). If you are at the Sachsenring for motorsport, this museum connects the region's racing present to its industrial past. Open daily. About 30 minutes from the circuit.