Moscow, on the Moskva River in western Russia, is the nation’s cosmopolitan capital. In its historic core is the Kremlin, a fortified complex that’s home to the president and tsarist treasures in the Armoury. Outside its walls is Red Square, the country’s symbolic center and site of Lenin’s Mausoleum, State Historical Museum and St. Basil’s Cathedral, known for its colorful, patterned, onion-shaped domes.