If you haven't seen the Library of Congress' exhibit 'The Empire That Was Russia'—The Prokudin-Gorskii Photographic Record Revealed, then you should take the time to look at it.
Before you do, though, read up on the process. A short summary: a photographer travelled around Russia in the 1910s ('nineteen-teens' if you're my grandmother), photographing everything from royalty to commoners to landscapes to architecture.The incredible thing is the medium he used—a camera with three filters, which provided him three photographic plates. One red, one green, one blue. He apparently had a stereoscope-like contraption that allowed him to project his images back together into one color photograph for others to view.