The Kremlin is both the heart of Moscow and of the entire Russian Empire. From Ivan the Terrible to Stalin, its high red walls bristling with towers have thrown a shadow over the tyrants that decided the fate of millions of people, while its corridors were a hotbed of conspiracy. This high place of history and power, as well as the spiritual centre of Russian orthodoxy, is dotted with lavish palaces, cathedrals and museums. A visit to the Kremlin is the highlight of any trip to Moscow.