Once the biggest cathedral in the world, the Hagia Sophia is considered the magnum opus of Byzantine architecture. Visitors say it is a must-see when in Istanbul and recommend taking a guided tour ...

On a hill overlooking the city of Palermo, in Sicily, sits a lesser-known gem of Italian art ... Italy's largest Byzantine-style mosaics, second in the world only to those of Hagia Sophia in ...

I rubbed my eyes in disbelief seeing a wall plaque at the Cummer Museum of Art and Gardens in Jacksonville ... Ottoman Empire for having turned the Hagia Sophia church into a mosque.

Commissioned by Emperor Justinian I, the Hagia Sophia was a marvel of engineering, featuring a vast dome that seemed to float above the central nave. It set a precedent for Byzantine architecture.