The Moscow Kremlin  sometimes referred to as simply The Kremlin, is a historic fortified complex at the heart of Moscow, overlooking the Moskva River (to the south), Saint Basil's Cathedral and Red Square (to the east) and the Alexander Garden (to the west). It is the best known of kremlins (Russian citadels) and includes four palaces, four cathedrals and the enclosing Kremlin Wall with Kremlin towers. The complex serves as the official residence of the President of Russia.

The existing Kremlin walls and towers were built by Italian masters over the years 1485 to 1495. The irregular triangle of the Kremlin wall encloses an area of 275,000 square meters (68 acres). Its overall length is 2235 meters (2444 yards), but the height ranges from 5 to 19 metres, depending on the terrain. The wall's thickness is between 3.5 and 6.5 meters.