Galata Tower,Istanbul Turkey

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. 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 Old Istanbul or Constantinople 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.
There is a restaurant and café on its upper floors which command a magnificent view of Istanbul and the Bosphorus. Also located on the upper floors is a night club which hosts a Turkish show. There are two operating elevators that carry visitors from the lower level to the upper levels...

Source:-Wikipedia