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Photo: Kris Roderburg, CC BY-SA 4.0 via Wikimedia Commons
The Dutch Mine Museum is in the former shaft of the Oranje Nassau I mine. Here you can visit to learn all about the Limburgish mining history. There is a large collection of mining tools. It is possible to do a guided tour of around 2-2½ hours which includes 2 movies.
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Indoor themepark for kids.
Theater Heerlen
Housed in the "Glaspaleis", a well-known and modernized glass building on the main market, this cultural institution usually has some exhibitions on display, and often free. As a multi-disciplinary cultural institution, it also hosts the city's main library, concerts, a music school and all kinds of workshops.
The main church in Heerlen built in the 12th century out of marlstone. This prominent church is still in use. During the opening times on Saturday guides give tours of the church.
This tower from the 12th century had throughout history several functions, living tower for nobels, a court and prison tower. You can visit the inside on a guided tour from the VVV Heerlen.