Orange Alternative were founded in Wrocław. Wrocław's dwarves, made of bronze, famously grew out of and commemorate Orange Alternative. In 1983 and 1997, Pope John Paul II visited the city. PTV Echo, the first non-state television station in Poland and in the post-communist countries, began to broadcast in Wrocław on 6 February 1990. In May 1997, Wrocław hosted the 46th International Eucharistic Congress. In July 1997, the city was heavily affected by the Millenium Flood, the worst flooding in post-war Poland, Germany, and the Czech Republic. About one-third of the area of the city was flooded. The smaller Widawa River also flooded the city simultaneously, worsening the damage. An earlier, equally devastating flood of the Oder river had taken place in 1903. A small part of the city was also flooded during the flood of 2010. From 2012 to 2015, the Wrocław water node was renovated and redeveloped to prevent further flooding. Municipal Stadium in Wrocław, opened in 2011, hosted three matches in Group A of the UEFA Euro 2012 championship. In 2016, Wrocław was declared the European Capital of Culture. In 2017, Wrocław hosted the 2017 World Games. Wrocław won the European Best Destination title in 2018. Since the end of the Cold War, Wrocław has come to terms with its German heritage, restoring its historical coat of arms and embracing the Austrian and Prussian aspects of the city's history during anniversary celebrations. Wrocław is now a unique European city of mixed heritage, with architecture influenced by Saxon, Bohemian, Austrian, and Prussian traditions, such as Silesian Gothic and its Baroque style of court builders of Habsburg Austria (Fischer von Erlach). Wrocław has a number of notable buildings by German modernist architects including the famous Centennial Hall (Hala Stulecia or Jahrhunderthalle; 1911–1913) designed by Max Berg. Geography Wrocław is located in the three mesoregions of the Silesian Lowlands (Wrocław Plain, Wrocław Valley, Oleśnica Plain) at an elevation of around 105–156 metres (Gajowe Hill and Maślickie Hill) above sea level. The city lies on the Oder River and its four tributaries, which supply it within the city limits – Bystrzyca, Oława, Ślęza and Widawa. In addition, the Dobra River and many streams flow through the city. The city has a sewage treatment plant on the Janówek estate. Flora and fauna There are 44 city parks and public green spaces covering around 800 hectares. The most notable are Szczytnicki Park, Park Południowy