Alsdorf is a municipality located in the district of Aachen within the state of North Rhine-Westphalia, Germany. Historically, the area was primarily known as a mining region until the 21st century. In recent years, the local economy has shifted toward the service sector, with many service companies establishing themselves in the city.
The municipality features several notable landmarks and recreational facilities, including an indoor arena, a cinema, a zoo, and a mining museum. One of the most famous sights in Alsdorf is its old castle.