01 Hagia Sophia
A working mosque again, which changed the visit: the ground floor is free and open outside prayer times, and the ticketed upper gallery is what partner listings actually sell. Shoes off, shoulders and knees covered, headscarf for women. Go at opening or after the last afternoon prayer.
02 The Blue Mosque & Basilica Cistern
The Blue Mosque is free and closes to visitors five times a day; the Cistern is ticketed and is the better visit of the two in summer, being the only cool place in Sultanahmet. Guided circuits from €57 bundle both with Hagia Sophia and are worth it mainly for the queue at the Cistern.
03 Topkapı Palace & the Grand Bazaar
Topkapı sells its own tickets and the Harem is a separate one, which catches people out — buy both or skip the palace. The Grand Bazaar costs nothing and is a place a guide genuinely helps, not for the shopping but for getting out of it.