I was linked to this cool post on Web Urbanist about sculptures erected in the former Yugoslavia (when it was still a part of the USSR) in the 1960s and 1970s. Each sculpture was supposed to commemorate a WWII battlefield or mark the location of a concentration camp. The original blog article mentioned that, once Yugoslavia broke up during the 1990s after the fall of the USSR, the monuments were abandoned and their meanings lost.
The Soviet Union got a lot of things wrong, but there is still something ethereal and fascinating about these monuments.
(Images from Human Scribbles)