9th-century fortifications

castle in Europe

thumb|200px|Hungarian Prehistory|Migration of Hungarians thumb|200px|Turkic Tamgas on some of the bricks from Sarkel

d'Angers castle

cultural heritage monument in Sintra, Portugal

erstwhile fortress located at the site of today's Royal Palace of Madrid (Spain)

Fortified construction in Catalonia

cultural property in Mérida, Spain

castle in Burgos, Spain

building in Shamakhi, Azerbaijan

Al-Rahba (/ALA-LC: al-Raḥba, sometimes spelled Raḥabah), also known as '''Qal'at al-Rahba''', which translates as the "Citadel of al-Rahba", is a medieval Arab fortress on the west bank of the Euphrates River, adjacent to the city of Mayadin in Syria. Situated atop a mound with an elevation of , al-Rahba oversees the Syrian Desert steppe. It has been described as "a fortress within a fortress"; it consists of an inner keep measuring , protected by an enclosure measuring . Al-Rahba is largely in ruins today as a result of wind erosion.

cultural property in Madrid, Spain

medieval castle in Vilasobroso, Galicia, Spain

cultural property in Sevilla, Spain

fort in India

building in Gioia del Colle, Italy

fort in Tunisia