The Citadel of Moscow, also known as the KREMLIN, is a fortified complex located in the heart of Moscow, Russia. It was originally built in the 12th century and has served as the residence of the Russian tsars and Soviet leaders. The KREMLIN is a symbol of Russian power and is home to several important government buildings, including the Grand KREMLIN Palace, the Senate, and the Armory. It is also a popular tourist destination, with its iconic red walls and towers.