Russia's Magnificent Metro Stations
Despite the restrictions, some fearless Wikipedians and flickr users have taken some beautiful pictures of metro systems all across the former Soviet Union, and Treehugger has put them together into a gorgeous (and informative) slide show (see samples above).
MP: For some stats on the Moscow subway system, see Wikipedia listing here, e.g. daily ridership of 7 million, 177 stations, 12 lines. Especially compared to the U.S., the Russia metro stations are more like museums, basilicas or churches than grimy, subway stations, with marble, chandeliers, columns, and stained glass.