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St. Basil's Cathedral, Moscow, Russia
Built between 1555 to 1561 by order of Ivan the Terrible, Moscow’s St. Basil's Cathedral is one of the most iconic symbols of Russian architecture. According to a local legend, two architects came up with its idiosyncratic design, Barma and Postnik, but no official attribution was ever achieved. All we know is that its nine-church structure has no precedent in Russian architecture, where large basilicas usually featured eight churches structured around a core basilica.

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