Wałbrzych (Polish: [ˈvawbʐɨx] ; German: Waldenburg; Lower Silesian: Walmbrig or Walmbrich; Czech: Valbřich or Valdenburk) is a city located in the Lower Silesian Voivodeship, in southwestern Poland, seat of Wałbrzych County. Wałbrzych lies approximately 70 kilometres (43 mi) southwest of the voivodeship capital Wrocław and about 30 kilometres (19 miles) from the Czech border. Wałbrzych has the status of municipality. Its administrative borders encompass an area of 85 km2 (33 sq mi) with 110,000 inhabitants, making it the second-largest city in the voivodeship and the 33rd largest in the country. Wałbrzych was once a major coal mining and industrial center alongside most of Silesia. The city was left undamaged after World War II and possesses rich historical architecture; among the most recognizable landmarks is the Książ Castle, the largest castle of Lower Silesia and the third-largest in Poland. In 2015 Wałbrzych became widely known due to the search for an allegedly buried Nazi gold train, which however was not found.