MapsOfWorld.com, Wikipedia.org and YourChildLearns.com are websites that feature maps of the Soviet Union and its satellite states. RussiaMap.org also features many Cold War era maps of the Soviet Union and the surrounding regions.
MapsOfWorld.com features a map of the Soviet Union and its satellite states as well as historical facts and information.
As of 2015, Wikipedia.org features a map of the Republics of the USSR and an ethnographic map of the Soviet Union and maps featuring changes in national boundaries after the end of the Cold War.
YourChildLearns.com features a map of the Iron Curtain and Ex-U.S.S.R. Countries including Poland, East Germany, Czechoslovakia, Romania and Bulgaria.
RussiaMap.org offers multiple maps of Russia and the Soviet Union featuring pre-Soviet information and maps from the 1970s and '80s.