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With many ponds you can find a lot of people fishing around there, though note that you need a permit to fish here.
The Aambos is an old hilly forest in the center of Heerlen. There is a small zoo, that has deer and other animals. In the park is the caumer stream which if followed upstream will get you to the '"oliemolen"' (oil mill). At the start of the park you can see the cloister huize berge, just look at the bridge crossing the nearby mijnsteenweg.
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.
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.