The Alsdorfer Weiher also entices visitors after work: how about a pedal boat trip, a sundowner in the beach bar or simply relaxing in the greenery while the children run around in the play area? But first it's time to dive into the greenery: upstream it gets really wild, this time in the natural version. The hustle and bustle disappears, the ponds become quieter, alder quarry forests are reflected in the water and a cormorant peers down from a dead branch in the middle of it all. The Middle Broichbach Valley nature reserve preserves an unspoiled landscape that we can enjoy on attractive paths. The old railroad embankment with its oak forest is also a natural treasure. A former railroad line runs here, which was mainly used by miners from the Aachen mining district. The Kellersberg colony is one of the early mining settlements. It is named after the nearby castle, which dates back to the 14th century and burned down completely in 1897. The Eschweiler Mining Association erected the current brick building in 1906 in the same year and architectural style as the miners' colony.