Experience Bundesliga atmosphere in Berlin at the Alte Försterei. Soccer reigns supreme at the An der Alten Försterei stadium. In no other stadium do fans get even closer to the action on the pitch. Perhaps the proximity to the blades of grass on the pitch is one reason why the fans of 1. FC Union Berlin are truly a sworn community. At games, the battle cry "Eisern Union" resounds from thousands of throats.