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This 3D puzzle is a replica of the St. Basil's Cathedral. Ivan IV, who conquered Kazan Khanate in Mongolia and gained Siberia, built the St. Basil's Cathedral on the Red Square in Moscow to celebrate a war victory by Russian architect Barma and Postnik in 1555. By the way, there was a horrible legend. The Czar let all construction workers to be blind so as not to design and build such a beautiful church again. St.Basil's Cathedral is the most famous landmark in Russia because this is made of the Byzantine style, Russian Slavic spirit and culture. The displayed 3D puzzle is an excellent learning material effective for improving problem-solving and spatio-perceptual capability.