text: Stadion An der Alten Försterei (; ) is a football stadium in Köpenick and the largest single-purpose football stadium in the German capital of Berlin. It has been home to football club 1. FC Union Berlin since its predecessor SC Union Oberschöneweide started playing in the stadium in 1920.
  The stadium's capacity was last redeveloped in 2009 and expanded in 2013. Some of the redevelopment work was carried out by over 2,300 Union Berlin supporters volunteering their services. During league matches the arena features a total capacity of 22,012. There are 3,617 seats available whilst the rest of the ground remains terracing.
  The stadium became also known for events like the annual "Weihnachtssingen" (Christmas Carols Event) and the "WM-Wohnzimmer" (World Cup Living Room) in 2014.
  History
  Opening
  In 1920, SC Union Oberschöneweide had to find a new home ground in Berlin as its former pitch had been built over by developers with residential buildings. The club moved away from the city to the north-western part of the borough of Köpenick. The inaugural match at the new stadium was played on 17 March 1920 between Oberschöneweide and Viktoria 89 Berlin in a friendly. The new stadium was officially opened in August 1920 with a match between Oberschöneweide and the then German champions 1. FC Nürnberg.