Jules Verne's "The Mysterious Island" was how I got interested in tech around the age of 6. I devoured all of his books that I could find after that and it was my introduction to geology ("Journey to the Center of the Earth"), geography ("In search of the castaways", "Around the world in eighty days"), oceanology ("Twenty thousand leagues under the sea"), Astronautics ("From the Earth to the Moon", "Around the moon"), dystopian/utopian world building ("The Begum's fortune") and so on and so forth.
EDIT: fixed the name of the book, thank you bradyd.
EDIT: fixed the name of the book, thank you bradyd.