Sour wells or sourlings are carbon dioxide-containing sources that are typical for regions with volcanic activity.

With a diameter of 100 metres, the Radio Telescope Effelsberg is one of the largest fully mobile radio telescopes on earth.  Since its commissioning in 1972, the company has continuously worked on improving its technology (e. g. B. a new surface of the antenna dish, better receivers for high-quality data, extremely lownoise electronics) so that even today it is still considered one of the most modern telescopes in the world.

The Eifel region’s farmhouse museum.

The market place in Mayen has always been a market. Since today, you can find the weekly market every Tuesday, Thursday and Saturday here. The large market, which is held every three months, is very popular and the fun fair "Lukasmarkt" in October, which is the largest fair in the northern of Rhineland-Palatinate.

The lime distillery in Bad Münstereifel-Iversheim is one of several distilleries that were built and operated by Roman legionaries as early as around 100 AD.