Mihrimah Sultan Mosque seems built more from light than from stone: its upper walls dissolve into rows of windows, and the single great dome covers a prayer hall that glows even on grey days. A lone slender minaret marks the skyline before the walls come into view. Inside, whitewashed surfaces and thin piers keep every sightline open. 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 Constantinople.
The coloured glass in the qibla windows is held to be original sixteenth-century work, and it does the decorating here. His patron was Mihrimah, the only daughter of Suleiman the Magnificent and one of the wealthiest women of the empire. She has a second mosque across the water at Üsküdar, and a modern story binds the two. Standing on the city's most exposed summit has a price: earthquake after earthquake has shaken the building, and careful restorations have kept it up. It remains a working neighbourhood mosque, where a few worshippers and the odd visitor share Sinan at his most luminous.