The Russian Ark by renown Russian director Alexander Sokurov was produced in 2002, but I've seen it just a few days ago. The whole film is staged in the Hermitage and shows its great halls and arts treasures in their full grandeur. There is no story as such, just a series of scenes: a great court ball, a reception of Persian prince by Nicolas I, a family tea-party of Nicolas II, and more. The costumes are splendid, although not always historically precise (e.g., the dancing officers wear their parade uniforms - instead of special ball uniforms, other cavaliers brandish long trousers - instead of culottes, and so forth). Minor faults actually.
Even on me, intimately acquainted with the Hermitage and other parts of the Winter Palace complex, this Russian-German co-production has made a formidable impression.