Make an excursion by boat on the Bosphorus strait. You actually find yourself between 2 continents: Europe and Asia.
Picture: bridge over the Bosphorus.
You should see the Bosphorus bridge as especially in the past it has had a lot of symbolic value in combining two continents together.
you must take a bout in the busphor to see very interesting places that you may not see except from the busphor.
Take a Bosphorus cruise, or take one of the water taxi's to and from the Asian side of Istanbul.
The Bosphorus hosts some of the worlds most beautiful and expesive waterfront