Saint Isaac's Cathedral or Isaakievskiy Sobor in Saint Petersburg, Russia, is the largest Russian Orthodox cathedral in the city.
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It is the largest orthodox basilica and the fourth largest cathedral in the world. Height: 333′ Length: 104.5 m (interior); 111.3 m (exterior-stairs) Dome dia. (outer): 25.8 m Interior area: 7,000 m² (interior); 8,000 m² (exterior-stairs) Architectural styles: Neoclassicism, Neoclassical architecture, Byzantine architecture Architect: Auguste de Montferrand .