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Tretyakov Gallery
The State Tretyakov Gallery (Russian: Государственная Третьяковская Галерея, Russian: ГТГ) is an art gallery in Moscow, Russia, the foremost depository of Russian fine art in the world.

Reference:
http://en.wikipedia.org/wiki/Tretyakov_Gallery

Official Website of the Tretyakov Gallery:
http://www.tretyakovgallery.ru/