The content creator for RealLifeLore explains how the USSR transformed the Asia for agriculture, and destroying the world's 4th largest lake in the process.
Great for low effort, max return volunteer work that makes a huge difference and can be done on the couch. A lot of it is simply placing points, lines, and polygons on aerial imaging.
Manhattan's Grid is a defining feature of New York City's Map, but the origins are pretty mysterious. The author of "The Greatest Grid," Gerard Koeppel gives some insight.