Union Berlin is a German football club based in the capital city. Founded in 1966, the club has a rich history and a passionate fan base. Union Berlin plays its home matches at the Stadion An der Alten Försterei, which has a capacity of over 22,000 spectators. The club's nickname is "Die Eisernen," which translates to "The Iron Ones." This nickname reflects the club's blue-collar roots and the hard-working mentality of its players. Union Berlin has primarily competed in the lower divisions of German football but achieved promotion to the Bundesliga for the first time in the 2019-2020 season. This historic achievement marked a significant milestone in the club's history.