Picture of a crowd of supporters getting ready to enter the Signal Iduna Park stadium in Dortmund. Westfalenstadion is a football stadium in Dortmund, North Rhine-Westphalia, Germany, which is the home of Borussia Dortmund. Officially called Signal Iduna Park for sponsorship reasons and BVB Stadion Dortmund in UEFA competitions, the name derives from the former Prussian province of Westphalia