Heerlen is a municipality and a city in the southeastern Netherlands and the second largest municipality in the province of Limburg. After its early Roman beginnings and a rather modest medieval period, Heerlen became a centre for the coal mining industry in the Netherlands in the late 19th century.
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A distinctive building in the city centre, is the so-called Glaspaleis (Glass Palace), listed as one of the world’s most important buildings of the 20th century. It was designed by architect Frits Peutz in 1935.
Some older buildings still exist in the centre of Heerlen, for instance a Romanesque style 12th century church (Pancratiuskerk), and a former prison tower from around the same period (Schelmentoren).