Also if you're in Moscow and interested in old Russian airliners make the trip out to Monino air museum. If you're a foreigner you have to get permission from them in advance (details on website). They have one of every old Soviet airliner, including that Tu114 LHR Tim mentions, and some amazing Air Force transports too. Take the Monino suburban train from Yaroslavl station to the end of the line, then it's about a 20 minute walk through an Air Force Base (no checking though) to the museum buried in the woods.

They have an English language guidebook with pictures of everything, written by one of the staff there who is a retired Yak test pilot. Interesting guy to talk to !