• In 1931 St. Isaac's was transformed into a museum
• It was following the beginning of the museum that Nikolai Kamenshchikov proved Nicolaus Copernicus' theorem concerning the rotation of the Earth within the cathedral
• Being one of the highest points in St. Petersburg, the church was often under heavy artillery from the Nazis attacks and the museum was shut down
• Also, a lot of the church's artwork was destroyed

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