Day 1
Iconic sights & old town
Hit the headline sights early before the crowds, then ease into Istanbul's café culture for the afternoon.
Morning
Hagia Sophia
1,500-year-old former cathedral, then mosque, then museum, now mosque again. The interior is breathtaking. Free; cover hair (women) and shoulders.
Afternoon
Blue Mosque
Sultan Ahmed Mosque — six minarets and 20,000 hand-painted blue tiles. Free, but closed during prayer times.
Evening
Topkapı Palace
Ottoman royal residence for 400 years. Don't skip the Harem (separate ticket) — it's the most atmospheric part.