I’m currently reading The Case for Space by Robert Zubrin and it’s really good. You can tell the guy dedicated his career and life to really thinking about how humans might live in Space, whether that be on the Moon, Mars or in the Asteroid Belt.
I recently read Why Nations Fail by Daron Acemoğlu and that was also very good, it explained the shortcomings of other theories such as the geographic determinism espoused by Jared Diamond in Guns, Germs and Steel although I think Why Nations Fail was a bit repetitive at times.
One that I have fond memories of is Oliver Rackham’s The History of the Countryside, which is a thoroughly enjoyable and comprehensive view of why the British countryside is as we see it now.
On a very different note there is Gödel, Escher, Bach: an Eternal Golden Braid by Douglas Hofstadter. A classic and extraordinary dive into logic.
And then there is Eric Berne’s Games People Play: The Psychology of Human Relationships, which introduced me (and thousands of others) to Transactional Analysis and certainly called some of my games out, as I expect it does with everyone.