Galata Tower was first built by the Byzantine Emperor Justinian in 507-508 AD. It was rebuilt by the Genoese in 1348 - 49. The tower was raised between 1445-46. It was damaged in the earthquake in the 1500s and was repaired by Architect Murad bin Hayreddin. III. After the tower was repaired during the Selim period, a bay window was added to the upper floor of the tower. In 1831, another fire occurred in the tower, II. Mahmut rises two more floors above the tower and the top of the tower is covered with the famous cone-shaped roof cover. Galata Tower was built in the masonry rubble stone mesh system. The exterior is stonework. The round arched window above the door was the soldiers' watchtower. It is a nine-storey building after the high ground floor. The windows in its cylindrical body are round arched with brickwork. Today, it is seen that the part of the building up to the third floor is in the Genoese character, while the other floors are in the Ottoman character.