There are a number of programms and projects for mass forest planting: USA "Great Plains Shelterbelt", USSR "Great Plan for the Transformation of Nature" and "Virgin Lands Campaign", PRC "Three-North Shelter Forest Program", Qatar "Sahara forest project" and else. Something representing them? (sort of a strange variant: Qaraqum channel, additionally filling a niche of Turkic wonder. Not so great, though, and highly controversal.) Major holy site for Orthodox believers, probably comparable to the Jerusalem itself.