The Kazan Kremlin includes many old buildings, the oldest of which is the Annunciation Cathedral (1554—62), the only 16th-century Russian church to have six piers and five apses. Like many of Kazan's buildings of the period, it is constructed of local pale sandstone rather than of brick. The renowned Pskov architects Postnik Yakovlev and Ivan Shirjay (called Barma) were invited by the Tzar to rebuild the Kazan Kremlin in stone. The cathedral bell tower was erected in five tiers at the urging of Ivan the Terrible and was scored to resemble the Ivan the Great Belltower in Moscow, but was pulled down by the Soviets in 1930.