Interior walls and ceiling, St. Isaac's Cathedral, UNESCO World Heritage Site, St. Petersburg, Russia, Europe

Interior fresco of The Last Supper, St. Isaac's Cathedral, UNESCO World Heritage Site, St. Petersburg, Russia, Europe

Interior, ceiling with belfry, St. Isaac's Cathedral, UNESCO World Heritage Site, St. Petersburg, Russia, Europe

Interior walls and ceiling, St. Isaac's Cathedral, UNESCO World Heritage Site, St. Petersburg, Russia, Europe

Ceiling frescoes, St. Isaac's Cathedral, UNESCO World Heritage Site, St. Petersburg, Russia, Europe

Interior of St. Isaac's Cathedral, St. Petersburg, UNESCO World Heritage Site, Leningrad Oblast, Russia, Europe

Interior of St. Isaac's Cathedral, UNESCO World Heritage Site, St. Petersburg, Leningrad Oblast, Russia, Europe

Interior view of St. Isaac's Cathedral, St. Petersburg, Russia, Europe

Interior view of St. Isaac's Cathedral, St. Petersburg, Russia, Europe

Interior of St. Isaac's Cathedral, (Issaakievsky Sobor), St. Petersburg, Russia

Ceiling, St. Isaac's Cathedral, St. Petersburg, Russia

Dome of St. Isaac's Cathedral, Saint Petersburg, Russia, Europe