ToughSF - Tough mega-projects that are currently science fiction, but might become reality someday.
https://toughsf.blogspot.com/
The youtube channel fauxrocktraining has a bunch of videos on how to make fake rocks and other structures out of cardboard and cement:
Basic Rock
Kid's Climbing Rocks
Easter Island statue made from cardboard/concrete
Kerguelen Islands aka Desolation Islands might be a good spot for a nuclear war resistant retreat. Other possibilities: testing ground for novel nuclear plants, space colonization training ground,
It's about the 2/3rd the size of Puerto Rico, but only about 100 people live there. That's because it's cold, windy, and 1800 miles from the nearest human habitation (Madagascar)
https://en.wikipedia.org/wiki/Kerguelen_Islands
Chinese electric tractor / loader