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These graphs show the number of Flickr members who have uploaded at least one photo or video with a particular camera on a given day over the last year. The graphs are "normalized", which is a fancy way of saying that they automatically correct for the fact that more people join Flickr each day: the graph moving up or down indicates a change in the camera's popularity relative to all other cameras used by Flickr members.
Begun in the 1930's, the Stalin-era underground was the USSR's largest civilian construction project, with stations built as "people's palaces." Employing outstanding architects and artists, it still looks amazing after all those years.