Is tailored to the Surveying measure. It conforms to the actual measurement (+ - 2%)There is only the outer surface. There is no interior design. It is filled.

The Galata Tower (Galata Kulesi in Turkish) — called Christea Turris (the Tower of Christ in Latin) by the Genoese — is a medieval stone tower in the Galata/Karaköy quarter of Istanbul, Turkey, just to the north of the Golden Horn's junction with the Bosphorus. One of the city's most striking landmarks, it is a high, cone-capped cylinder that dominates the skyline and offers a panoramic vista of Istanbul's historic peninsula and its environs.The nine-story tower is 66.90 meters tall (62.59 m without the ornament on top, 51.65 m at the observation deck), and was the city's tallest structure when it was built. The elevation at ground level is 35 meters above sea-level. The tower has an external diameter of 16.45 meters at the base, an 8.95 meters diameter inside, and walls that are 3.75 meters thick.The Romanesque style tower was built as Christea Turris (Tower of Christ) in 1348 during an expansion of the Genoese colony in Constantinople.