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This is the Northwest Corner Tower of the Forbidden City in Beijing. Corner towers on the four coigns of lofty walls of the Forbidden City -- the Imperial Palace during Ming and Qing dynasties of China -- were established in 1420, rebuilt in the Qing Dynasty (1644-1911). As one part of the Forbidden City, they served as the defense facility just as the lofty walls, the gate towers and the moat.