The Spice Market, Blue Mosque, Basilica Cistern, Hagia Sofia and the Topkapi Palace are all well worth visiting. The first two are free, with appropriate clothing necessary for the mosque. The others have a fee - but get there early (eg 9 am) if you want to avoid long queues. History is all about you.
See the Grand Bazaar but don't buy anything there. Also, try to avoid the pesky souvenir salesmen who pester you everywhere!
However, definitely try the hot salep drink, made of dried powdered roots of a mountain orchid, milk, sugar, cinnamon, rose water and sometimes coconut. delicious and different.
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