It was built by Osman III in 1755. It is located on the west shore of Bosphorus and faced to the sea of Marmara. The light-house is in the shape of a white tower and erected on one of the ramparts of the fortresses’. It is 40 meters high from the sea level. It helps the ships to find their directions by flashing for every 6 seconds. This light-house was built after an important shipwreck. The accident occurred when a galleon directed by Haci Kaptan routed towards Egypt, was stranded at Kumkapi in a storm. When Sultan Osman III and Grand Vizier Sait Pasha had learnt about the accident they went to Kumkapi and helped to rescue the galleon and the sailors.