Süleymaniye is Sinan saying everything. Built between 1550 and 1557 for Suleiman the Magnificent at the peak of Ottoman power, it sits on the third hill with a complete külliye around it — school, soup kitchen, hospital, hamam, library, tombs. The kind of complex that says: this is what we are.
Three kilometres, all morning, light through the windows. Arrive at Vezneciler metro and walk up the hill from the west. The first stop is Sinan's own octagonal tomb, just outside the complex wall — the man who designed the city's skyline is buried in something the size of a garden shed, and most visitors walk past it without noticing.
Inside the mosque, look up. Sinan's dome is the work; the smaller half-domes are the technique. The garden behind holds the tombs of Süleyman and Hürrem (Roxelana), her tilework arguably better than his.
End at Sahaflar Çarşısı — the old book bazaar, tucked between Beyazıt Mosque and the Grand Bazaar entrance. Hand-bound Korans, Ottoman-era prints, calligraphy on rag paper. Pick up something small to remember the morning. Beyazıt tram is two minutes' walk.