http://www.metro.ru/ - an interesting resource devoted to Moscow metro.
It was like this in 1940:
http://www.metro.ru/map/1940/metro.ru-1940map-big1.jpg
It's now like this:
http://www.metro.ru/map/2005/metro.ru-2005.09map.gif
There are much more, like the photographs of almost every station as they looked like at different times.
http://www.metro.ru/stations/koltsev...lobodskaya.jpg
