The Kremlin is the main symbol of Moscow. At one time, Karamzin wrote that this complex is a "place of great historical memories," many of which are associated with its towers. There are 20 towers in total, each surrounded by various stories and secrets. Below are some of the secret guardians of the Kremlin. Beklemishevskaya Tower One of the few towers that has hardly been rebuilt since its construction in the 15th century. It is known for being used almost immediately after completion as a place of confinement for boyars. Moscow prince Vasily III used it as a prison for disgraced advisors. Nabatskaya Tower For a long time, it served as a signal tower. Guards would ring the bell at the top in case of an approaching enemy or other trouble. In 1771, the bell rang to warn of a plague outbreak in Moscow, but the sound attracted a large crowd of townspeople, which ultimately worsened the epidemic. Tsarskaya Tower One of the youngest and shortest towers, standing at only 16 meters. It was erected in memory of Ivan the Terrible. During his reign, a wooden watchtower stood in this place, from which the Tsar would observe the surroundings of the Kremlin.