12th-century fortifications

a palace in Fontainebleau, France

castle in Stirling, Scotland, UK

Castle housing the national archeology museum near Paris

castle in Naples, Italy

thumb|Marksburg and the river Rhine The Marksburg () is a castle above the town of Braubach in Rhineland-Palatinate, Germany. It is one of the principal sites of the Rhine Gorge UNESCO World Heritage Site. The fortress was used for protection rather than as a residence for royal families. It has a striking example of a bergfried designed as a butter-churn tower. Of the 40 hill castles between Bingen am Rhein and Koblenz the Marksburg was one of only two which had never been destroyed (the other being Maus Castle) and at least the only one that had never fallen into disrepair.

castle ruin in the town of Kenilworth, Warwickshire, England, UK

crusader castle in Israel

Irish castle

medieval castle in England

castle in Middleham, North Yorkshire, England, UK

castle in England

castle in Germany

castle in England

oldest city wall of Paris, France

ruins of a castle in Denmark

Historic Castle in Lismore, Co Waterford, Ireland

Castle in Altena, North Rhine-Westphalia, Germany

thumb|Mount Soffeh, Isfahan Dizkuh () or Shahdiz (), was a fortress near Isfahan, Iran, notably held by the Nizari Ismailis. It was captured and destroyed in Seljuk sultan Muhammad Tapar's anti-Nizari campaign. Its conspicuous, picturesque ruins lie about 8km south of Isfahan on a subpeak of Mount Soffeh.

castle in Germany

former prison and current museum in Acre, Israel

ruins of a royal castle located in North Zealand, Denmark

castle in Lancashire, England, UK

castle in South Yorkshire, England, UK

medieval castle in Yorkshire, England, UK

Grade I listed castle in Haverfordwest, United Kingdom

cultural property in Sevilla, Spain

castle in Germany

castle

Grade I listed castle in Egremont, Cumberland, Cumbria , England, UK

castle in Leicestershire, England, UK

castle ruin in Landstuhl, Germany