One of the stranger manifestations of Soviet messaging in the 1950s and 1960s was the use of silviculture propaganda: giant signs created in fields and forests by carefully-planted plots of trees. Back in the mid-20th century, these were presumably thought of as tokens to be seen by future generations from communist spaceships above the earth.
The content of the messages were fairly simple, but they are still visible today. And through Google Maps, anyone can now see them, even decades after their aspirational creation.
Click the images to view them larger, or click the titles to view on Google Maps (smaller embedded maps are below each image — zoom in to get more detail).