The Architect · Yusuf · Istanbul
Küçük Ayasofya Mosque
Justinian built this first, five years before the big one. It's the sketch for the masterpiece, and it's free.
The 6th-century church of Saints Sergius and Bacchus — the octagon-in-a-square that was Hagia Sophia's rehearsal.
— Yusuf, The Architect
The move — Yusuf's insider tip for Küçük Ayasofya Mosque — is in the app.
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