Mihrimah Sultan Mosque seems built more from light than from stone — its upper walls dissolve into rows of windows. Sinan raised it in the 1560s on the highest of the old city's seven hills, beside the Edirne Gate, where the old land road entered the city. His patron was Mihrimah, daughter of Suleiman the Magnificent; her name means "sun and moon" in Persian, and it fits a building whose single great dome covers a prayer hall that glows even on grey days.
You climb toward it and a lone slender minaret marks the skyline before the walls appear. Inside, whitewashed surfaces and thin piers keep every sightline open, and there is far less tilework than in the imperial mosques downhill; the windows carry the decoration instead. Earthquakes have shaken the building repeatedly, and careful restorations have kept it standing. Today it remains a working neighbourhood mosque, where a few worshippers and the odd visitor share Sinan at his most luminous.