Look up at the massive, cylindrical walls of the tower. When the Genoese colony rebuilt this structure in the middle of the fourteenth century, they named it the Christea Turris, or the Tower of Christ. At that time, it was the tallest building in the city, standing at approximately 62.59 meters high from the ground to the tip of its conical roof. After Sultan Mehmed the Second conquered Constantinople in 1453, the Genoese peacefully handed over the keys to the colony. Throughout the Ottoman era, the tower lived many lives. It served as a shelter for prisoners of war during the reign of Suleiman the Magnificent and later as an astronomical observatory. However, its most vital role for centuries was as the Galata Fire Tower. Because fires often devastated the city's historic wooden houses, specialized watchmen kept a twenty-four-hour vigil from the balcony above, using lanterns to signal the location of smoke across the Golden Horn to the fire brigades in the Old City. This masonry giant survived earthquakes like the Great Earthquake of 1,509 and several devastating fires, requiring major restorations in 1794 and 1831.