Friedestrom Fortress was built by the order of Archbishop Friedrich von Saarwerden in 1373 and named it in his honor. Basalt, trachyte, tuff rocks, plus brick were used in the construction. For more than 400 years, these walls protected the customs office, housed inside the fortress that brought the city treasury substantial income. Now there is a restaurant in this building. The strong Rhine Tower (Rheintor) of the end of the XIV century leaves a great impression. Once the Rhine flowed right under the city walls and ships moored near the tower. Now, the Rhine flows a few hundred meters away from the city.
One of the round towers of the fortress was rebuilt into a windmill (Windmühle) in the XVII century. It remained unchanged until today. A District Museum (Kreismuseum) works in a family house in the fortress. In it you can see the local crafts and textile samples. Europe's largest collection of tin objects in the Art Nouveau style is also on display here. Since 1935, the fortress has had an outdoor theater, where plays are staged every summer based on popular fairy tales. lowed right under the city walls and ships moored near the tower. Now, the Rhine flows a few hundred meters away from the city.