A kreml, in Russian, is a citadel or walled city center. Several Russian cities have such structures, but the most famous one is in Moscow and is known simply as “the Kremlin.” It was the residence Russia’s czars until 1712, and in 1918, it became the Soviet Union’s political and administrative center. Triangular and surrounded by crenellated walls, it occupies 90 acres (36.4 hectares) in the historic core of Moscow, a site that has been continuously inhabited since what century BCE? Discuss
Source: The Free Dictionary