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Observatory to watch the stars.
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Nature Reserve
The biggest nature reserve in south Limburg. A few entrances to this heathland from Heerlen, only half of this is within the city boundaries, the otherhalf is in Brunssum. There is plenty of walking paths, simply choose a path at the entrance and follow the signpoles, these are very well marked out through the hilly heathlands and forests. The reserve has a streamlet flowing through it called the 'rode beek' (red stream). There are paths for horse riders, some locations are great for mountain biking, and the paved paths are easily doable with a bike.
With many ponds you can find a lot of people fishing around there, though note that you need a permit to fish here.
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.
Indoor themepark for kids.