Trinity Cathedral, Saint Petersburg

This late-Empire-style cathedral, sometimes called the Izmailovsky Cathedral for the guards regiment it served, is crowned by a large central dome and four smaller ones painted deep blue and studded with golden stars. Completed in the mid-nineteenth century, it was for a time among the largest churches in the city and hosted the wedding of the writer Dostoevsky. A monument of captured cannons once stood before it, and the vast white interior seats thousands of worshippers.