Watch Online Free on Watchseries. The film traces the fate of mosaic art in Russia through the Frolov dynasty — master craftsmen whose distinctive work marks churches, museums, and public buildings. The story of the Mosaic Workshop in St. Petersburg, which helped decorate the Church of the Savior on Spilled Blood, Lenin’s Mausoleum, and Mayakovskaya metro station, is told through personal recollections, archival documents, and images shot in the present.