|Heerlen is a municipality and a town in the southeastern Netherlands. It currently is part and center of the urban area Parkstad Limburg. In recent years the population of Heerlen is declining from nearly 100,000 in 1999 to about 90,000 today.|
In the 19th century it became a centre for the coal mining industry. In the 20th century, architect Frits Peutz played a major role shaping the city. His most famous design, and a distinctive building in the city centre, is the so-called Glaspaleis (Glass Palace), formerly housing the Schunck department store and now a cultural centre, located next to the Pancratiuskerk. It is a national monument and listed as one of the 1000 most important buildings of the 20th century.