At the heart of Istanbul’s historic peninsula, Hagia Sophia brings successive eras of the city into view. Its vast dome and monumental interior were shaped by the Byzantine Empire, and the present building was completed in the sixth century under Emperor Justinian I.
Its architecture was ambitious in scale and engineering. A great central dome appears to float above the interior, while arches, galleries and supporting structures reveal how builders addressed the challenge of spanning such an expansive space. The result became an enduring reference point in the history of architecture.
Hagia Sophia’s uses have changed along with the political and religious life of Istanbul. It served as a Byzantine cathedral, later became an imperial mosque, and was used as a museum before returning to mosque status. Each chapter contributed to the site’s significance and to the meanings people find in it.
The building is best understood as a layered historical place, not a monument to just one era. Its present status as a mosque is part of that continuing history, alongside its Byzantine origins and its broader importance to the city’s cultural heritage.

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