The church in question was the Cathedral of Christ the Savior, one of the world's largest houses of worship. In 1931, Joseph Stalin ordered it destroyed to make room for a "Palace of the Soviets," which was never built. You can watch a film of its destruction here
After the Soviet Union fell, the cathedral was rebuilt, with modern facilities such as air conditioning, elevators, telecommunication facilities and underground parking. It reopened in 2000.
Destroyed by Stalin in 1931:
Today rebuilt: