The Moscow Kremlin is a very old historic fortified complex at the very heart of Moscow and it has four palaces, four cathedrals, the well-known Kremlin Wall around it and great Kremlin towers. The complex used to be an official residence of the head of Russia when Moscow was its capital and is now the
government’s headquarters. Several structures were built in stone at the behest of Ivan Kalita in the late 1320s and early 1330s, and then the construction of churches began. At first the great wall was wooden, but to protect the area from fire it was demolished and the stone wall appeared.