Fatih area is one of the old parts of Istanbul full of history. You can see many religious places here. The most important one is Fatih Mosque. One of the amazing mosques in the world.
When you go there try to find “AT PAZARI” area
There are nice cafes in At Pazarı. My favorite is Eski Kafa…. You can have Ottoman drinks and even chestnut as in the picture below