Golden Horn: This horn-shaped estuary divides European Istanbul. One of the best natural harbours in the world, it was once the centre for the Byzantine and Ottoman navies and commercial shipping interests. Today, attractive parks and promenades line the shores, a picturesque scene especially as the sun goes down over the water. At Fener and Balat, neighbourhoods midway up the Golden Horn, there are entire streets filled with old wooden houses, churches, and synagogues dating from Byzantine and Ottoman times.