From the Metropolitan Museum of Art, this page provides an explanatory description of the 6th-century church Hagia Sophia in modern-day Istanbul. Various images of the structure and links to other related topics are also included.

At this site from Fordham University you can access a wealth of information on the Byzantine Empire, from journal articles, to photo galleries, to downloadable software.

A collection of resources about domes that includes basic facts about domes, challenges faced by dome builders, famous domes from around the world, and a lab that helps you understand different kinds of materials used to construct domes....