Toruń is a city in northern Poland, on the Vistula River. Its population was 203,148 as of June 2014. Toruń is one of the oldest cities in Poland. The medieval old town of Toruń is the birthplace of Polish astronomer Nicolaus Copernicus. In 1997 the medieval part of the city was designated a UNESCO World Heritage Site. In 2007 the Old Town in Toruń was added to the list of Seven Wonders of Poland. Previously it was the capital of the Toruń Voivodeship (1975–98) and the Pomeranian Voivodeship (1921–45). Since 1999, Toruń has been a seat of the self-government of the Kuyavian-Pomeranian Voivodeship and, as such, is one of its two capitals (together with Bydgoszcz). The cities and neighboring counties form the Bydgoszcz-Toruń twin city metropolitan area.