in the city fled or were expelled in accordance to the Potsdam Agreement. The town was repopulated by Poles expelled from former eastern Poland annexed by the Soviet Union, particularly from Borysław, Drohobycz and Stanisławów, as well as Poles returning from France and Belgium and from forced labour in Germany. Wałbrzych was one of the few areas where a number of Germans were held back as they were deemed indispensable for the economy, e.g. coal mining. An ethnic German society has been maintained in Wałbrzych since 1957. Greeks, refugees of the Greek Civil War, settled in Wałbrzych in the 1950s. The city was relatively unscathed by the Second World War, and as a result of combining the nearby administrative districts with the town and the construction of new housing estates, Wałbrzych expanded geographically. At the beginning of the 1990s, because of new social and economic conditions, a decision was made to close down the town's coal mines. In 1995, a Museum of Industry and Technology was set up on the facilities of the oldest coal mine in the area, KWK THOREZ. The 2005 the film was filmed in and around Wałbrzych. Geography Wałbrzych is located in the Central Sudeten Mountains, near the border with the Czech Republic and Germany. The city is located by the Pełcznica River at 450–500 m above sea level in a picturesque structural basin of Wałbrzych above which there are wooded ranges of the Wałbrzych Mountains. The highest elevation in the city is Mount Borowa, also known as the Black Mountain, 853 m (2798 ft) above sea level, with an observation tower since 2007, which is the highest peak of the Wałbrzych mountains. There are seven city parks in the city, and in the main city park (King Jan III Sobieski Park) is the only mountain shelter in Poland, located in the city center PTTK Harcówka. Nature protection Protected areas in Wałbrzych Książ Landscape Park – northern outskirts of the city Przełomy pod Książem Nature reserve – northern outskirts of the city Sudety Wałbrzyskie Landscape Park – southern outskirts of the city Chełmiec Mountain Natura 2000 area – western outskirts of the city There are several natural monuments in the city; among them is the coat of arms oak, a descendant of the oak which was the inspiration for the coat of arms of the city, as evidenced by a nearby stone with the inscription ""