Berlin Gate from 1722, eastern gate of the former Prussian fortress, Wesel, Lower Rhine, North Rhine-Westphalia, Germany, Europe

Frieze depicting Frederick III, formerly attached to the Kleve Gate of the Wesel town fortifications, now on display at the town hall, Wesel, Lower Rhine, North Rhine-Westphalia, Germany, Europe

Citadel from 1687, built as the largest fortification of the Wesel fortress, main gate, today municipal museum, today art and music school, Wesel, Lower Rhine, North Rhine-Westphalia, Germany, Europe

Sparrenburg or Sparrenberg Castle, landmark of the city of Bielefeld, Bielefeld, East Westphalia, North Rhine-Westphalia, Germany, Europe

Severinstorburg, old city gate, Severinsviertel, Altstadt-Süd, Cologne, North Rhine-Westphalia, Germany, Europe

Severinstorburg, old city gate, Severinsviertel, Altstadt-Süd, Cologne, North Rhine-Westphalia, Germany, Europe

Severinstorburg, old city gate, Severinsviertel, Altstadt-Süd, Cologne, North Rhine-Westphalia, Germany, Europe

Paffendorf Castle, Bergheim, North Rhine-Westphalia, Germany, Europe

View through the Rhine Gate in the evening, Zons, Dormagen, Lower Rhine, North Rhine-Westphalia, Germany, Europe

Linn Castle, moated castle, Krefeld, Lower Rhine, North Rhine-Westphalia, Germany, Europe

Linn Castle, moated castle, Krefeld, Lower Rhine, North Rhine-Westphalia, Germany, Europe

Castle Kempen, Kurkölnische Landesburg, Kempen, Lower Rhine, North Rhine-Westphalia, Germany, Europe

Klever Tor with the church towers of St. Viktor in the evening, Xanten, Lower Rhine, North Rhine-Westphalia, Germany, Europe

Schelmenturm, Monheim am Rhein, Bergisches Land, North Rhine-Westphalia, Germany, Europe

Gatehouse with monastery Basilica of St. Andrew, Monastery Knechtsteden, Dormagen, Lower Rhine, North Rhine-Westphalia, Germany, Europe

Medieval city walls with Lindenpforte, Cottbus, Brandenburg, Lower Lusatia, Germany, Europe

"Klever Gate, northern gate of the medieval fortifications, Xanten, Lower Rhine, North Rhine-Westphalia, Germany, Europe"