The Cathedral of Our Savior on the Spilled Blood stands out for its complicated and picturesque outline, as well as rich and multicolored decoration on the background of the austere Petersburg church architecture. The rich mosaics that cover the walls of the cathedral both inside and outside are of a great value. The mosaic panels were made in Frolov's workshop to the originals by outstanding Russian artists, including Vasnetsov, Nesterov, Riabushkin and others. The total area of the mosaic is impressive 7,050 square meters. In the decor of interiors Italian marbles and Russian semiprecious stones, such as jasper, topaz, rock crystal and others are used.