The Moscow Kremlin, a fortress and palace along the Moscow river, has been the center of Russian politics since the time of the Russian Empire. Together with the Red Square, it was designated a World Heritage Site in 1990. Russian Orthodox Saint Basil's Cathedral, located in Red Square, was built in the middle of the 16th century to commemorate the victory of tsar Ivan the Terrible over the Khanate of Kazan. It is one of Moscow's most famous buildings.