Fortified walls and towers of the Aljaferia palace dating from the 11th century, Saragossa (Zaragoza), Aragon, Spain, Europe

Fortified walls and towers of the Aljaferia Palace dating from the 11th century, Saragossa (Zaragoza), Aragon, Spain, Europe

Walls and towers at night of the Aljaferia Palace, dating from the 11th century, Saragossa (Zaragoza), Aragon, Spain, Europe

Fortified walls and towers of the Aljaferia palace dating from the 11th century, Saragossa (Zaragoza), Aragon, Spain, Europe

Fortified walls and towers of the Aljaferia palace dating from the 11th century, Saragossa (Zaragoza), Aragon, Spain, Europe

Fortified walls and towers of the Aljaferia palace dating from the 11th century, Saragossa (Zaragoza), Aragon, Spain, Europe

View of Sant'Agostino Convent in the Sassi area of Matera and ravine, Basilicata, Italy, Europe

Sant'Agostino Convent in the Sassi area of Matera, Basilicata, Italy, Europe

Campanile and detail of the facade of the Basilica di San Marco, dating from the 11th century, Piazza San Marco, San Marco, Venice, UNESCO World Heritage Site, Veneto, Italy, Europe

Facade do Obradoiro of the Baroque style 11th century Roman Catholic Cathedral, Catedral de Santiago de Compostela, UNESCO World Heritage Site, Santiago de Compostela, Galicia, Spain, Europe

Sandstone head, Baphuon style dating from the 11th century from Siem Reap, Cambodia, Guimet Museum, Paris, France, Europe

Norman style old stone window at 11th Century St Nicholas Church, Oddington, near Stow on the Wold, Gloucestershire