The Commerzbank-Arena is a sports stadium in Frankfurt, Hesse, Germany. Commonly known by its original name, Waldstadion ("Forest Stadium"), the stadium opened in 1925. The stadium has been upgraded several times since then; the most recent remodelling was its redevelopment as a football-only stadium in preparation for the 2005 FIFA Confederations Cup and 2006 FIFA World Cup. With a capacity of 51,500 spectators, it is among the ten largest football stadiums in Germany. The stadium was one of the nine venues of 2011 FIFA Women's World Cup, and hosted four matches including the final.